CVE-2025-26465 (GCVE-0-2025-26465)

Vulnerability from cvelistv5 – Published: 2025-02-18 18:27 – Updated: 2026-07-14 12:41
VLAI
Title
Openssh: machine-in-the-middle attack if verifyhostkeydns is enabled
Summary
A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning the attack complexity high.
Severity
6.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-390 - Detection of Error Condition Without Action
Assigner
References
URL Tags
https://access.redhat.com/errata/RHSA-2025:16823 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:3837 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:6993 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:8385 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2025-26465 vdb-entryx_refsource_REDHAT
https://access.redhat.com/solutions/7109879
https://bugzilla.redhat.com/show_bug.cgi?id=2344780 issue-trackingx_refsource_REDHAT
https://seclists.org/oss-sec/2025/q1/144
https://lists.debian.org/debian-lts-announce/2025…
https://www.openwall.com/lists/oss-security/2025/…
https://www.openwall.com/lists/oss-security/2025/…
https://www.theregister.com/2025/02/18/openssh_vu…
https://bugzilla.suse.com/show_bug.cgi?id=1237040
https://security-tracker.debian.org/tracker/CVE-2…
https://ftp.openbsd.org/pub/OpenBSD/patches/7.6/c…
https://ubuntu.com/security/CVE-2025-26465
https://www.openssh.com/releasenotes.html#9.9p2
https://blog.qualys.com/vulnerabilities-threat-re…
https://lists.mindrot.org/pipermail/openssh-unix-…
https://security.netapp.com/advisory/ntap-2025022…
https://www.vicarius.io/vsociety/posts/cve-2025-2…
https://www.vicarius.io/vsociety/posts/cve-2025-2…
http://seclists.org/fulldisclosure/2025/May/8
http://seclists.org/fulldisclosure/2025/May/7
http://seclists.org/fulldisclosure/2025/Feb/18
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…
Impacted products
Vendor Product Version
Affected: 6.8p1 , ≤ 9.9p1 (custom)
Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:8.0p1-26.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::appstream
    cpe:/o:redhat:enterprise_linux:8::baseos
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:8.7p1-45.el9 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:9::baseos
    cpe:/a:redhat:enterprise_linux:9::appstream
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support Unaffected: 0:8.7p1-38.el9_4.5 , < * (rpm)
    cpe:/o:redhat:rhel_eus:9.4::baseos
    cpe:/a:redhat:rhel_eus:9.4::appstream
 Create a notification for this product.
Red Hat Red Hat Discovery 1.14 Unaffected: sha256:f33991d766b618a128fb99fbe4f9b61c5004f7c6aa73b2b38e28d59e56c64d63 , < * (rpm)
    cpe:/a:redhat:discovery:1.14::el9
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
 Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
 Create a notification for this product.
Siemens SIDIS Secured SmartPlug Affected: 0 , < V7.26.0310 (custom)
Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
Create a notification for this product.
Date Public
2025-02-17 00:00
Show details on NVD website
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\"affected\"}, {\"cpes\": [\"cpe:/o:redhat:rhel_eus:9.4::baseos\", \"cpe:/a:redhat:rhel_eus:9.4::appstream\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 9.4 Extended Update Support\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"0:8.7p1-38.el9_4.5\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"openssh\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/a:redhat:discovery:1.14::el9\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Discovery 1.14\", \"versions\": [{\"status\": \"unaffected\", \"version\": \"sha256:f33991d766b618a128fb99fbe4f9b61c5004f7c6aa73b2b38e28d59e56c64d63\", \"lessThan\": \"*\", \"versionType\": \"rpm\"}], \"packageName\": \"discovery/discovery-server-rhel9\", \"collectionURL\": \"https://catalog.redhat.com/software/containers/\", \"defaultStatus\": \"affected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:10\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 10\", \"packageName\": \"openssh\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:6\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 6\", \"packageName\": \"openssh\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:/o:redhat:enterprise_linux:7\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat Enterprise Linux 7\", \"packageName\": \"openssh\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"unknown\"}, {\"cpes\": [\"cpe:/a:redhat:openshift:4\"], \"vendor\": \"Red Hat\", \"product\": \"Red Hat OpenShift Container Platform 4\", \"packageName\": \"rhcos\", \"collectionURL\": \"https://access.redhat.com/downloads/content/package-browser/\", \"defaultStatus\": \"affected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2025-02-10T21:56:03.853Z\", \"value\": \"Reported to Red Hat.\"}, {\"lang\": \"en\", \"time\": \"2025-02-17T00:00:00.000Z\", \"value\": \"Made public.\"}], \"datePublic\": \"2025-02-17T00:00:00.000Z\", \"references\": [{\"url\": \"https://access.redhat.com/errata/RHSA-2025:16823\", \"name\": \"RHSA-2025:16823\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2025:3837\", \"name\": \"RHSA-2025:3837\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2025:6993\", \"name\": \"RHSA-2025:6993\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2025:8385\", \"name\": \"RHSA-2025:8385\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2025-26465\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/solutions/7109879\"}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2344780\", \"name\": \"RHBZ#2344780\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://seclists.org/oss-sec/2025/q1/144\"}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client\u0027s memory resource first, turning the attack complexity high.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-390\", \"description\": \"Detection of Error Condition Without Action\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-01-29T18:20:15.981Z\"}, \"x_redhatCweChain\": \"CWE-390: Detection of Error Condition Without Action\"}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-26465\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-14T12:41:01.736Z\", \"dateReserved\": \"2025-02-10T18:31:47.978Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2025-02-18T18:27:16.843Z\", \"assignerShortName\": \"redhat\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.