Common Weakness Enumeration
CWE-476
AllowedNULL Pointer Dereference
Abstraction: Base · Status: Stable
The product dereferences a pointer that it expects to be valid but is NULL.
6367 vulnerabilities reference this CWE, most recent first.
CVE-2021-20296 (GCVE-0-2021-20296)
Vulnerability from cvelistv5 – Published: 2021-04-01 00:00 – Updated: 2024-08-03 17:37
VLAI
EPSS
VEX
Summary
A flaw was found in OpenEXR in versions before 3.0.0-beta. A crafted input file supplied by an attacker, that is processed by the Dwa decompression functionality of OpenEXR's IlmImf library, could cause a NULL pointer dereference. The highest threat from this vulnerability is to system availability.
Severity
No CVSS data available.
CWE
Assigner
References
5 references
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CVE-2021-20274 (GCVE-0-2021-20274)
Vulnerability from cvelistv5 – Published: 2021-03-09 13:11 – Updated: 2024-08-03 17:37
VLAI
EPSS
VEX
Summary
A flaw was found in privoxy before 3.0.32. A crash may occur due a NULL-pointer dereference when the socks server misbehaves.
Severity
No CVSS data available.
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://www.privoxy.org/announce.txt | x_refsource_MISC |
| https://bugzilla.redhat.com/show_bug.cgi?id=1936662 | x_refsource_MISC |
| https://security.gentoo.org/glsa/202107-16 | vendor-advisoryx_refsource_GENTOO |
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CVE-2021-20213 (GCVE-0-2021-20213)
Vulnerability from cvelistv5 – Published: 2021-03-25 18:57 – Updated: 2024-08-03 17:30
VLAI
EPSS
VEX
Summary
A flaw was found in Privoxy in versions before 3.0.29. Dereference of a NULL-pointer that could result in a crash if accept-intercepted-requests was enabled, Privoxy failed to get the request destination from the Host header and a memory allocation failed.
Severity
No CVSS data available.
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://www.privoxy.org/3.0.29/user-manual/whatsn… | x_refsource_MISC |
| https://bugzilla.redhat.com/show_bug.cgi?id=1928739 | x_refsource_MISC |
| https://security.gentoo.org/glsa/202107-16 | vendor-advisoryx_refsource_GENTOO |
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CVE-2021-20196 (GCVE-0-2021-20196)
Vulnerability from cvelistv5 – Published: 2021-05-26 21:16 – Updated: 2024-08-03 17:30
VLAI
EPSS
VEX
Summary
A NULL pointer dereference flaw was found in the floppy disk emulator of QEMU. This issue occurs while processing read/write ioport commands if the selected floppy drive is not initialized with a block device. This flaw allows a privileged guest user to crash the QEMU process on the host, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Severity
No CVSS data available.
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://bugs.launchpad.net/qemu/+bug/1912780 | x_refsource_MISC |
| https://www.openwall.com/lists/oss-security/2021/… | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2021070… | x_refsource_CONFIRM |
| https://lists.debian.org/debian-lts-announce/2022… | mailing-listx_refsource_MLIST |
| https://lists.debian.org/debian-lts-announce/2022… | mailing-listx_refsource_MLIST |
Impacted products
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CVE-2021-4217 (GCVE-0-2021-4217)
Vulnerability from cvelistv5 – Published: 2022-08-24 15:08 – Updated: 2024-08-03 17:16
VLAI
EPSS
VEX
Summary
A flaw was found in unzip. The vulnerability occurs due to improper handling of Unicode strings, which can lead to a null pointer dereference. This flaw allows an attacker to input a specially crafted zip file, leading to a crash or code execution.
Severity
No CVSS data available.
CWE
- CWE-476 - - NULL Pointer Dereference
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://bugs.launchpad.net/ubuntu/+source/unzip/+… | x_refsource_MISC |
| https://bugzilla.redhat.com/show_bug.cgi?id=2044583 | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2021-4217 | x_refsource_MISC |
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CVE-2021-4209 (GCVE-0-2021-4209)
Vulnerability from cvelistv5 – Published: 2022-08-24 15:07 – Updated: 2024-08-03 17:16
VLAI
EPSS
VEX
Summary
A NULL pointer dereference flaw was found in GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances.
Severity
No CVSS data available.
CWE
- CWE-476 - - NULL Pointer Dereference
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://gitlab.com/gnutls/gnutls/-/issues/1306 | x_refsource_MISC |
| https://bugzilla.redhat.com/show_bug.cgi?id=2044156 | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2021-4209 | x_refsource_MISC |
| https://gitlab.com/gnutls/gnutls/-/merge_requests/1503 | x_refsource_MISC |
| https://gitlab.com/gnutls/gnutls/-/commit/3db3527… | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2022091… | x_refsource_CONFIRM |
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CVE-2021-4198 (GCVE-0-2021-4198)
Vulnerability from cvelistv5 – Published: 2022-03-07 11:30 – Updated: 2024-09-17 02:06
VLAI
EPSS
VEX
Title
messaging_ipc.dll NULL Pointer Dereference in multiple Bitdefender products (VA-10016)
Summary
A NULL Pointer Dereference vulnerability in the messaging_ipc.dll component as used in Bitdefender Total Security, Internet Security, Antivirus Plus, Endpoint Security Tools, VPN Standalone allows an attacker to arbitrarily crash product processes and generate crashdump files. This issue affects: Bitdefender Total Security versions prior to 26.0.3.29. Bitdefender Internet Security versions prior to 26.0.3.29. Bitdefender Antivirus Plus versions prior to 26.0.3.29. Bitdefender Endpoint Security Tools versions prior to 7.2.2.92. Bitdefender VPN Standalone versions prior to 25.5.0.48.
Severity
6.1 (Medium)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.bitdefender.com/support/security-advi… | x_refsource_MISC |
| https://www.zerodayinitiative.com/advisories/ZDI-… | x_refsource_MISC |
Impacted products
5 products
| Vendor | Product | Version | |
|---|---|---|---|
| Bitdefender | Total Security |
Affected:
unspecified , < 26.0.3.29
(custom)
|
|
| Bitdefender | Internet Security |
Affected:
unspecified , < 26.0.3.29
(custom)
|
|
| Bitdefender | Antivirus Plus |
Affected:
unspecified , < 26.0.3.29
(custom)
|
|
| Bitdefender | Endpoint Security Tools |
Affected:
unspecified , < 7.2.2.92
(custom)
|
|
| Bitdefender | VPN Standalone |
Affected:
unspecified , < 25.5.0.48
(custom)
|
Date Public
2022-02-05 00:00
Credits
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CVE-2021-4188 (GCVE-0-2021-4188)
Vulnerability from cvelistv5 – Published: 2021-12-30 06:55 – Updated: 2024-08-03 17:16
VLAI
EPSS
VEX
Title
NULL Pointer Dereference in mruby/mruby
Summary
mruby is vulnerable to NULL Pointer Dereference
Severity
6.8 (Medium)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://huntr.dev/bounties/78533fb9-f3e0-47c2-86d… | x_refsource_CONFIRM |
| https://github.com/mruby/mruby/commit/27d1e0132a0… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| mruby | mruby/mruby |
Affected:
unspecified , < 3.1
(custom)
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CVE-2021-4158 (GCVE-0-2021-4158)
Vulnerability from cvelistv5 – Published: 2022-08-24 15:10 – Updated: 2024-08-03 17:16
VLAI
EPSS
VEX
Summary
A NULL pointer dereference issue was found in the ACPI code of QEMU. A malicious, privileged user within the guest could use this flaw to crash the QEMU process on the host, resulting in a denial of service condition.
Severity
No CVSS data available.
CWE
- CWE-476 - - NULL Pointer Dereference
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://gitlab.com/qemu-project/qemu/-/issues/770 | x_refsource_MISC |
| https://bugzilla.redhat.com/show_bug.cgi?id=2035002 | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2021-4158 | x_refsource_MISC |
| https://www.mail-archive.com/qemu-devel%40nongnu.… | x_refsource_MISC |
| https://gitlab.com/qemu-project/qemu/-/commit/9bd… | x_refsource_MISC |
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CVE-2021-4145 (GCVE-0-2021-4145)
Vulnerability from cvelistv5 – Published: 2022-01-25 19:11 – Updated: 2024-08-03 17:16
VLAI
EPSS
VEX
Summary
A NULL pointer dereference issue was found in the block mirror layer of QEMU in versions prior to 6.2.0. The `self` pointer is dereferenced in mirror_wait_on_conflicts() without ensuring that it's not NULL. A malicious unprivileged user within the guest could use this flaw to crash the QEMU process on the host when writing data reaches the threshold of mirroring node.
Severity
No CVSS data available.
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=2034602 | x_refsource_MISC |
| https://gitlab.com/qemu-project/qemu/-/commit/66f… | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2022031… | x_refsource_CONFIRM |
| https://security.gentoo.org/glsa/202208-27 | vendor-advisoryx_refsource_GENTOO |
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Mitigation MIT-56
Implementation
For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished [REF-1484].
Mitigation
Requirements
Select a programming language that is not susceptible to these issues.
Mitigation
Implementation
Check the results of all functions that return a value and verify that the value is non-null before acting upon it.
Mitigation
Architecture and Design
Identify all variables and data stores that receive information from external sources, and apply input validation to make sure that they are only initialized to expected values.
Mitigation
Implementation
Explicitly initialize all variables and other data stores, either during declaration or just before the first usage.
No CAPEC attack patterns related to this CWE.