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CVE-2025-26465 OpenSSH

Affected softwareOpenSSH
Severity6.8 Medium CVSS 3.1 2 scores
WeaknessCWE-390
Published18 Feb 2025
Updated5 Nov 2026

Description

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.

Exploitation status

Proof of concept only

A proof of concept exists, but no reviewed exploit catalogue lists this CVE.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: poc CISA recorded that an exploit has been demonstrated. Automatable: no, technical impact: total.
  • Indexed PoC 2 indexed Published artifacts you can open, in GitHub PoC; first seen 2025-02-18.
  • EPSS 7.7% chance in 30 days

1 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

IndexArtifactStarsFirst seen
GitHub PoC MitM attack allowing a malicious interloper to impersonate a legitimate server when a client attempts to connect to it 10 2025-02-18
GitHub PoC Patch Manual para a correção das CVE-2025-26465-e-CVE-2025-26466, para sistemas sem update do OpenSSH 1 2025-02-21

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review human Researcher
  • Record active
Decided by Manual classification of this CVE in the legacy dataset
Finding A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

6.8 MEDIUM v3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 6.8 MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N secalert@redhat.com Secondary published
CVSS 3.1 6.8 MEDIUM CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N NVD Primary

Affected software and releases

Products and versions

6 products, 10 version entries
SourceVendorProductSchemeAffected versions
nvd debian debian linux generic 11.0 · 12.0
nvd netapp active iq unified manager generic any version
nvd netapp ontap generic 9
nvd openbsd openssh generic 6.8:p1 · ≥ 6.9 and ≤ 9.8 · 9.9 · 9.9:p1
nvd redhat enterprise linux generic 9.0
nvd redhat openshift container platform generic 4.0

References

URLTags
https://access.redhat.com/errata/RHSA-2025:16823
https://access.redhat.com/errata/RHSA-2025:3837
https://access.redhat.com/errata/RHSA-2025:6993
https://access.redhat.com/errata/RHSA-2025:8385
https://access.redhat.com/security/cve/CVE-2025-26465 Third Party Advisory
https://access.redhat.com/solutions/7109879
https://bugzilla.redhat.com/show_bug.cgi?id=2344780 Issue Tracking, Third Party Advisory
https://seclists.org/oss-sec/2025/q1/144 Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2025/Feb/18
http://seclists.org/fulldisclosure/2025/May/7

Timeline

Published2025-02-18By the CVE Program.
NVD record modified2026-11-05NVD's own last-modified date for this record.