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20 vulnerabilities found for libreswan by the libreswan Project
CVE-2026-94453 (GCVE-0-2026-94453)
Vulnerability from nvd – Published: 2026-10-13 21:27 – Updated: 2026-10-13 21:27
VLAI
EPSS
VEX
Title
IKEv2 Use-After-Free bug when using IKE-over-TCP
Summary
Libreswan's pluto daemon has a use-after-free vulnerability when a client connecting using IKE over TCP closes the connection and another packet (retransmit or malicious) is received for the same tuple. IKE state is retained in memory after the client closes the connection, storing a pointer to iface_endpoint inside ike_sa.sa->st_iface_endpoint. Once this invalid pointer is used, the daemon crashes and restarts. This vulnerability can be triggered before the remote peer has authenticated itself. Continued exploitation can lead to a denial of service. Remote code execution could be possible. The IKE over TCP option is not enabled by default; only configurations that contain listen-tcp=yes are affected.
Severity
7.5 (High)
CWE
- CWE-416 - Use After Free
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2026-94453/CVE… | vendor-advisory |
| https://libreswan.org/security/CVE-2026-94453/ | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
4.0 , ≤ 5.3.2
(semver)
Affected: 5.4 , ≤ 5.4 (semver) Unaffected: 5.3.3 (semver) Unaffected: 5.4.1 (semver) |
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"value": "Libreswan\u0027s pluto daemon has a use-after-free vulnerability when a client connecting using IKE over TCP closes the connection and another packet (retransmit or malicious) is received for the same tuple. IKE state is retained in memory after the client closes the connection, storing a pointer to iface_endpoint inside ike_sa.sa-\u003est_iface_endpoint. Once this invalid pointer is used, the daemon crashes and restarts. This vulnerability can be triggered before the remote peer has authenticated itself. Continued exploitation can lead to a denial of service. Remote code execution could be possible. The IKE over TCP option is not enabled by default; only configurations that contain listen-tcp=yes are affected."
}
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CVE-2026-77207 (GCVE-0-2026-77207)
Vulnerability from nvd – Published: 2026-10-13 21:28 – Updated: 2026-10-13 21:28
VLAI
EPSS
VEX
Title
Null Pointer Dereference in PKCS#7 bundle with no certificates
Summary
Libreswan has a null pointer dereference bug in the PKCS#7 handling code for IKE certificate authentication. When libreswan decodes an IKE CERT payload of type CERT_PKCS7_WRAPPED_X509, it guards the PKCS#7 blob with SEC_PKCS7ContainsCertsOrCrls() and then iterates the certificate list with SEC_PKCS7GetCertificateList(). The two NSS APIs disagree on a SignedData that carries a CRL but no certificates: ContainsCertsOrCrls() returns PR_TRUE (there is a CRL), so the guard passes, but GetCertificateList() returns NULL (there are no certificates). This causes libreswan to dereference a null pointer leading to a crash and restart. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. No remote code execution is possible. Continued exploitation can cause a denial of service.
Severity
7.5 (High)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2026-77207/CVE… | vendor-advisory |
| https://libreswan.org/security/CVE-2026-77207/ | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
4.7 , ≤ 5.3.2
(semver)
Affected: 5.4 , ≤ 5.4 (semver) Unaffected: 5.3.3 (semver) Unaffected: 5.4.1 (semver) |
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CVE-2026-77206 (GCVE-0-2026-77206)
Vulnerability from nvd – Published: 2026-10-13 21:28 – Updated: 2026-10-13 21:28
VLAI
EPSS
VEX
Title
IKEv2 pre-authentication Null Pointer Dereference in EAP code
Summary
Libreswan's IKEv2 state machine has a null pointer dereference bug in the EAP handling code for authentication. As a result of inconsistency within the IKEv2 state machine code, this bug can be triggered by any IKEv2 connection, even if EAP is not configured at all. The error is caused by a fall-through where it incorrectly dereferences ike->sa.st_eap which is NULL. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. The bug results in a crash and restart of the pluto daemon. No remote code execution is possible. Continued exploitation can cause a denial of service.
Severity
7.5 (High)
CWE
- CWE-476 - Null Pointer Dereference
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2026-77206/CVE… | vendor-advisory |
| https://libreswan.org/security/CVE-2026-77206/ | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
4.7 , ≤ 5.3.2
(semver)
Affected: 5.4 , ≤ 5.4 (semver) Unaffected: 5.3.3 (semver) Unaffected: 5.4.1 (semver) |
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CVE-2026-77205 (GCVE-0-2026-77205)
Vulnerability from nvd – Published: 2026-10-13 21:28 – Updated: 2026-10-13 21:28
VLAI
EPSS
VEX
Title
Denial of Service via sending bogus X.509 certificates
Summary
Libreswan in FIPS mode has a vulnerability where badly formed received certificates are rejected, but not deleted from the NSS cache. As a result, any real certificates with the same serial number are rejected as well. This can be abused to lock out legitimate peers from connecting. The add_decoded_cert() function missed a call to CERT_DestroyCertificate() due to an incorrect fix for CVE-2026-14957. Sending bogus certificates with new serial numbers could prevent the real certificates with those serial numbers from connecting until the service has restarted.
Severity
CWE
- CWE-772 - Missing Release of Resource after Effective Lifetime
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2026-77205/CVE… | vendor-advisory |
| https://libreswan.org/security/CVE-2026-77205/ | patch |
| https://libreswan.org/security/CVE-2026-14957/CVE… | related |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
5.3 , ≤ 5.3.2
(semver)
Unaffected: 5.3.3 (semver) |
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CVE-2026-14957 (GCVE-0-2026-14957)
Vulnerability from nvd – Published: 2026-09-02 02:19 – Updated: 2026-09-02 13:00
VLAI
EPSS
VEX
Title
FIPS mode assertion failure via malicious CERT payload
Summary
In FIPS mode, Libreswan's add_decoded_cert() function calls CERT_ExtractPublicKey() and asserts that the result is not NULL. However, CERT_ExtractPublicKey() returns NULL when public key extraction fails, for example if the RSA exponent is set to 0. A remote attacker can send a malformed X.509 certificate in a CERT payload to trigger the assertion, causing the pluto daemon to abort and restart. Continued exploitation causes a denial of service. No remote code execution is possible. Both IKEv1 and IKEv2 are affected. The vulnerability is only exploitable when both the OS and libreswan are running in FIPS mode and at least one CA certificate is loaded. The CERT payload is processed before peer authentication, so no credentials are needed to exploit this. Configurations using only PreSharedKey (PSK) authentication with no CA certificates loaded in the NSS database are not vulnerable.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 13:00 UTC
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2026-14957/CVE… | vendor-advisory |
| https://libreswan.org/security/CVE-2026-14957/ | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
3.0 , ≤ 5.3.1
(semver)
Unaffected: 5.3.2 (semver) |
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CVE-2026-50722 (GCVE-0-2026-50722)
Vulnerability from nvd – Published: 2026-07-02 21:34 – Updated: 2026-07-07 17:02
VLAI
EPSS
VEX
Title
IKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v1_5) authentication payload
Summary
Libreswan, via the function RSA_authenticate_hash_signature_pkcs1_1_5_rsa(), did not correctly verify the DER encoding of the ASN.1 digest when the IKEv2 AUTH payload was encoded using RSASSA-PKCS1-v1_5 (RFC 8017). A remote attacker can use a variation on the Bleichenbacher attack to forge the AUTH payload when small public exponents are used (e.g., e=3), leading to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the AUTH payload, could trigger an assertion leading to denial-of-service. The daemon aborts and restarts; continued exploitation causes sustained denial of service. Remote code execution is not possible. X.509 certificate verifications of the remote IKE peer are not affected.
Severity
7.5 (High)
8.1 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-06 18:12 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2026-50722/CVE… | vendor-advisory |
| https://libreswan.org/security/CVE-2026-50722/ | patch |
| https://libreswan.org/security/CVE-2026-50721/CVE… | related |
| https://www.rfc-editor.org/rfc/rfc8017 | technical-description |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
0 , ≤ 5.3
(semver)
Unaffected: 5.3.1 (semver) |
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CVE-2026-50721 (GCVE-0-2026-50721)
Vulnerability from nvd – Published: 2026-07-02 21:44 – Updated: 2026-07-07 17:01
VLAI
EPSS
VEX
Title
IKEv1 Denial of Service via RSA-SHA1 (PKCS#1 Version 1.5 Encrypted) authentication payload
Summary
Libreswan, via the function RSA_authenticate_hash_signature_raw_rsa(), did not correctly verify the length of the authentication hash when the SIG payload of an IKEv1 packet was encoded using PKCS #1 RSA Encryption as per RFC 2313. A remote attacker can use a variation on the Bleichenbacher attack to forge the SIG payload when small public exponents are being used (e.g., e=3), which could lead to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the SIG payload, could trigger an assertion leading to denial-of-service. The daemon aborts and restarts; continued exploitation causes sustained denial of service. Remote code execution is not possible. X.509 certificate verifications of remote IKE peers are not affected.
Severity
7.5 (High)
8.1 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-06 18:12 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2026-50721/CVE… | vendor-advisory |
| https://libreswan.org/security/CVE-2026-50721/ | patch |
| https://libreswan.org/security/CVE-2026-50722/CVE… | related |
| https://www.rfc-editor.org/rfc/rfc2313 | technical-description |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
0 , ≤ 5.3
(semver)
Unaffected: 5.3.1 (semver) |
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CVE-2026-12413 (GCVE-0-2026-12413)
Vulnerability from nvd – Published: 2026-07-02 21:19 – Updated: 2026-07-07 17:02
VLAI
EPSS
VEX
Title
IKEv2 Denial of Service via malformed fragmentation
Summary
An invalidly formatted IKEv2 fragment causes the Libreswan pluto daemon to crash and restart. Continued exploitation would cause a denial of service. The function reassemble_v2_incoming_fragments() would ignore unknown outer payloads but still store these in a fixed size array msg_digest.digest[PAYLIMIT]. An off-by-one error in the assertion PASSERT(logger, md->digest_roof < elemsof(md->digest)) causes the daemon to abort. No remote code execution is possible. Any configuration that allows IKEv2 connections that do not set fragmentation=no are vulnerable. IKEv1 is not affected.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-06 18:12 UTC
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
4.6 , ≤ 5.3
(semver)
Unaffected: 5.3.1 (semver) |
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CVE-2020-1763 (GCVE-0-2020-1763)
Vulnerability from nvd – Published: 2020-05-12 13:41 – Updated: 2024-08-04 06:46
VLAI
EPSS
VEX
Summary
An out-of-bounds buffer read flaw was found in the pluto daemon of libreswan from versions 3.27 till 3.31 where, an unauthenticated attacker could use this flaw to crash libreswan by sending specially-crafted IKEv1 Informational Exchange packets. The daemon respawns after the crash.
Severity
7.5 (High)
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2020-1763/CVE-… | x_refsource_CONFIRM |
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| https://github.com/libreswan/libreswan/commit/471… | x_refsource_CONFIRM |
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| https://security.gentoo.org/glsa/202007-21 | vendor-advisoryx_refsource_GENTOO |
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| https://us-cert.cisa.gov/ics/advisories/icsa-21-040-04 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| the libreswan Project | libreswan |
Affected:
from versions 3.27 till 3.31
|
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CVE-2019-10155 (GCVE-0-2019-10155)
Vulnerability from nvd – Published: 2019-06-12 13:51 – Updated: 2024-08-04 22:10
VLAI
EPSS
VEX
Summary
The Libreswan Project has found a vulnerability in the processing of IKEv1 informational exchange packets which are encrypted and integrity protected using the established IKE SA encryption and integrity keys, but as a receiver, the integrity check value was not verified. This issue affects versions before 3.29.
Severity
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2019-10155/ | x_refsource_MISC |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2… | x_refsource_CONFIRM |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://access.redhat.com/errata/RHSA-2019:3391 | vendor-advisoryx_refsource_REDHAT |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| the libreswan Project | libreswan |
Affected:
3.29
|
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CVE-2026-77207 (GCVE-0-2026-77207)
Vulnerability from cvelistv5 – Published: 2026-10-13 21:28 – Updated: 2026-10-13 21:28
VLAI
EPSS
VEX
Title
Null Pointer Dereference in PKCS#7 bundle with no certificates
Summary
Libreswan has a null pointer dereference bug in the PKCS#7 handling code for IKE certificate authentication. When libreswan decodes an IKE CERT payload of type CERT_PKCS7_WRAPPED_X509, it guards the PKCS#7 blob with SEC_PKCS7ContainsCertsOrCrls() and then iterates the certificate list with SEC_PKCS7GetCertificateList(). The two NSS APIs disagree on a SignedData that carries a CRL but no certificates: ContainsCertsOrCrls() returns PR_TRUE (there is a CRL), so the guard passes, but GetCertificateList() returns NULL (there are no certificates). This causes libreswan to dereference a null pointer leading to a crash and restart. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. No remote code execution is possible. Continued exploitation can cause a denial of service.
Severity
7.5 (High)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2026-77207/CVE… | vendor-advisory |
| https://libreswan.org/security/CVE-2026-77207/ | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
4.7 , ≤ 5.3.2
(semver)
Affected: 5.4 , ≤ 5.4 (semver) Unaffected: 5.3.3 (semver) Unaffected: 5.4.1 (semver) |
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CVE-2026-77206 (GCVE-0-2026-77206)
Vulnerability from cvelistv5 – Published: 2026-10-13 21:28 – Updated: 2026-10-13 21:28
VLAI
EPSS
VEX
Title
IKEv2 pre-authentication Null Pointer Dereference in EAP code
Summary
Libreswan's IKEv2 state machine has a null pointer dereference bug in the EAP handling code for authentication. As a result of inconsistency within the IKEv2 state machine code, this bug can be triggered by any IKEv2 connection, even if EAP is not configured at all. The error is caused by a fall-through where it incorrectly dereferences ike->sa.st_eap which is NULL. A malicious IKE_AUTH packet can trigger this bug, meaning the peer does not need to be authenticated. The bug results in a crash and restart of the pluto daemon. No remote code execution is possible. Continued exploitation can cause a denial of service.
Severity
7.5 (High)
CWE
- CWE-476 - Null Pointer Dereference
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2026-77206/CVE… | vendor-advisory |
| https://libreswan.org/security/CVE-2026-77206/ | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
4.7 , ≤ 5.3.2
(semver)
Affected: 5.4 , ≤ 5.4 (semver) Unaffected: 5.3.3 (semver) Unaffected: 5.4.1 (semver) |
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CVE-2026-77205 (GCVE-0-2026-77205)
Vulnerability from cvelistv5 – Published: 2026-10-13 21:28 – Updated: 2026-10-13 21:28
VLAI
EPSS
VEX
Title
Denial of Service via sending bogus X.509 certificates
Summary
Libreswan in FIPS mode has a vulnerability where badly formed received certificates are rejected, but not deleted from the NSS cache. As a result, any real certificates with the same serial number are rejected as well. This can be abused to lock out legitimate peers from connecting. The add_decoded_cert() function missed a call to CERT_DestroyCertificate() due to an incorrect fix for CVE-2026-14957. Sending bogus certificates with new serial numbers could prevent the real certificates with those serial numbers from connecting until the service has restarted.
Severity
CWE
- CWE-772 - Missing Release of Resource after Effective Lifetime
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2026-77205/CVE… | vendor-advisory |
| https://libreswan.org/security/CVE-2026-77205/ | patch |
| https://libreswan.org/security/CVE-2026-14957/CVE… | related |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
5.3 , ≤ 5.3.2
(semver)
Unaffected: 5.3.3 (semver) |
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CVE-2026-94453 (GCVE-0-2026-94453)
Vulnerability from cvelistv5 – Published: 2026-10-13 21:27 – Updated: 2026-10-13 21:27
VLAI
EPSS
VEX
Title
IKEv2 Use-After-Free bug when using IKE-over-TCP
Summary
Libreswan's pluto daemon has a use-after-free vulnerability when a client connecting using IKE over TCP closes the connection and another packet (retransmit or malicious) is received for the same tuple. IKE state is retained in memory after the client closes the connection, storing a pointer to iface_endpoint inside ike_sa.sa->st_iface_endpoint. Once this invalid pointer is used, the daemon crashes and restarts. This vulnerability can be triggered before the remote peer has authenticated itself. Continued exploitation can lead to a denial of service. Remote code execution could be possible. The IKE over TCP option is not enabled by default; only configurations that contain listen-tcp=yes are affected.
Severity
7.5 (High)
CWE
- CWE-416 - Use After Free
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2026-94453/CVE… | vendor-advisory |
| https://libreswan.org/security/CVE-2026-94453/ | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
4.0 , ≤ 5.3.2
(semver)
Affected: 5.4 , ≤ 5.4 (semver) Unaffected: 5.3.3 (semver) Unaffected: 5.4.1 (semver) |
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CVE-2026-14957 (GCVE-0-2026-14957)
Vulnerability from cvelistv5 – Published: 2026-09-02 02:19 – Updated: 2026-09-02 13:00
VLAI
EPSS
VEX
Title
FIPS mode assertion failure via malicious CERT payload
Summary
In FIPS mode, Libreswan's add_decoded_cert() function calls CERT_ExtractPublicKey() and asserts that the result is not NULL. However, CERT_ExtractPublicKey() returns NULL when public key extraction fails, for example if the RSA exponent is set to 0. A remote attacker can send a malformed X.509 certificate in a CERT payload to trigger the assertion, causing the pluto daemon to abort and restart. Continued exploitation causes a denial of service. No remote code execution is possible. Both IKEv1 and IKEv2 are affected. The vulnerability is only exploitable when both the OS and libreswan are running in FIPS mode and at least one CA certificate is loaded. The CERT payload is processed before peer authentication, so no credentials are needed to exploit this. Configurations using only PreSharedKey (PSK) authentication with no CA certificates loaded in the NSS database are not vulnerable.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 13:00 UTC
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2026-14957/CVE… | vendor-advisory |
| https://libreswan.org/security/CVE-2026-14957/ | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
3.0 , ≤ 5.3.1
(semver)
Unaffected: 5.3.2 (semver) |
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CVE-2026-50721 (GCVE-0-2026-50721)
Vulnerability from cvelistv5 – Published: 2026-07-02 21:44 – Updated: 2026-07-07 17:01
VLAI
EPSS
VEX
Title
IKEv1 Denial of Service via RSA-SHA1 (PKCS#1 Version 1.5 Encrypted) authentication payload
Summary
Libreswan, via the function RSA_authenticate_hash_signature_raw_rsa(), did not correctly verify the length of the authentication hash when the SIG payload of an IKEv1 packet was encoded using PKCS #1 RSA Encryption as per RFC 2313. A remote attacker can use a variation on the Bleichenbacher attack to forge the SIG payload when small public exponents are being used (e.g., e=3), which could lead to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the SIG payload, could trigger an assertion leading to denial-of-service. The daemon aborts and restarts; continued exploitation causes sustained denial of service. Remote code execution is not possible. X.509 certificate verifications of remote IKE peers are not affected.
Severity
7.5 (High)
8.1 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-06 18:12 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2026-50721/CVE… | vendor-advisory |
| https://libreswan.org/security/CVE-2026-50721/ | patch |
| https://libreswan.org/security/CVE-2026-50722/CVE… | related |
| https://www.rfc-editor.org/rfc/rfc2313 | technical-description |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
0 , ≤ 5.3
(semver)
Unaffected: 5.3.1 (semver) |
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CVE-2026-50722 (GCVE-0-2026-50722)
Vulnerability from cvelistv5 – Published: 2026-07-02 21:34 – Updated: 2026-07-07 17:02
VLAI
EPSS
VEX
Title
IKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v1_5) authentication payload
Summary
Libreswan, via the function RSA_authenticate_hash_signature_pkcs1_1_5_rsa(), did not correctly verify the DER encoding of the ASN.1 digest when the IKEv2 AUTH payload was encoded using RSASSA-PKCS1-v1_5 (RFC 8017). A remote attacker can use a variation on the Bleichenbacher attack to forge the AUTH payload when small public exponents are used (e.g., e=3), leading to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the AUTH payload, could trigger an assertion leading to denial-of-service. The daemon aborts and restarts; continued exploitation causes sustained denial of service. Remote code execution is not possible. X.509 certificate verifications of the remote IKE peer are not affected.
Severity
7.5 (High)
8.1 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-06 18:12 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2026-50722/CVE… | vendor-advisory |
| https://libreswan.org/security/CVE-2026-50722/ | patch |
| https://libreswan.org/security/CVE-2026-50721/CVE… | related |
| https://www.rfc-editor.org/rfc/rfc8017 | technical-description |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
0 , ≤ 5.3
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CVE-2026-12413 (GCVE-0-2026-12413)
Vulnerability from cvelistv5 – Published: 2026-07-02 21:19 – Updated: 2026-07-07 17:02
VLAI
EPSS
VEX
Title
IKEv2 Denial of Service via malformed fragmentation
Summary
An invalidly formatted IKEv2 fragment causes the Libreswan pluto daemon to crash and restart. Continued exploitation would cause a denial of service. The function reassemble_v2_incoming_fragments() would ignore unknown outer payloads but still store these in a fixed size array msg_digest.digest[PAYLIMIT]. An off-by-one error in the assertion PASSERT(logger, md->digest_roof < elemsof(md->digest)) causes the daemon to abort. No remote code execution is possible. Any configuration that allows IKEv2 connections that do not set fragmentation=no are vulnerable. IKEv1 is not affected.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-06 18:12 UTC
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Libreswan Project | libreswan |
Affected:
4.6 , ≤ 5.3
(semver)
Unaffected: 5.3.1 (semver) |
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CVE-2020-1763 (GCVE-0-2020-1763)
Vulnerability from cvelistv5 – Published: 2020-05-12 13:41 – Updated: 2024-08-04 06:46
VLAI
EPSS
VEX
Summary
An out-of-bounds buffer read flaw was found in the pluto daemon of libreswan from versions 3.27 till 3.31 where, an unauthenticated attacker could use this flaw to crash libreswan by sending specially-crafted IKEv1 Informational Exchange packets. The daemon respawns after the crash.
Severity
7.5 (High)
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2020-1763/CVE-… | x_refsource_CONFIRM |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2… | x_refsource_CONFIRM |
| https://bugzilla.redhat.com/show_bug.cgi?id=1813329 | x_refsource_MISC |
| https://github.com/libreswan/libreswan/commit/471… | x_refsource_CONFIRM |
| https://www.debian.org/security/2020/dsa-4684 | vendor-advisoryx_refsource_DEBIAN |
| https://security.gentoo.org/glsa/202007-21 | vendor-advisoryx_refsource_GENTOO |
| https://cert-portal.siemens.com/productcert/pdf/s… | x_refsource_CONFIRM |
| https://us-cert.cisa.gov/ics/advisories/icsa-21-040-04 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| the libreswan Project | libreswan |
Affected:
from versions 3.27 till 3.31
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CVE-2019-10155 (GCVE-0-2019-10155)
Vulnerability from cvelistv5 – Published: 2019-06-12 13:51 – Updated: 2024-08-04 22:10
VLAI
EPSS
VEX
Summary
The Libreswan Project has found a vulnerability in the processing of IKEv1 informational exchange packets which are encrypted and integrity protected using the established IKE SA encryption and integrity keys, but as a receiver, the integrity check value was not verified. This issue affects versions before 3.29.
Severity
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://libreswan.org/security/CVE-2019-10155/ | x_refsource_MISC |
| https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2… | x_refsource_CONFIRM |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://access.redhat.com/errata/RHSA-2019:3391 | vendor-advisoryx_refsource_REDHAT |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| the libreswan Project | libreswan |
Affected:
3.29
|
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