CVE-2025-26465

MEDIUM

OpenSSH - Info Disclosure

Title source: llm

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.

Exploits (2)

nomisec SCANNER 7 stars

by rxerium · poc

https://github.com/rxerium/CVE-2025-26465

View Code ZIP pw:eip

nomisec WRITEUP 1 stars

by dolutech · poc

https://github.com/dolutech/patch-manual-CVE-2025-26465-e-CVE-2025-26466

View Code ZIP pw:eip

References (25)

[Third Party Advisory] https://access.redhat.com/security/cve/CVE-2025-26465

[Issue Tracking, Third Party Advisory] https://bugzilla.redhat.com/show_bug.cgi?id=2344780

[Mailing List, Third Party Advisory] https://seclists.org/oss-sec/2025/q1/144

[Third Party Advisory] https://blog.qualys.com/vulnerabilities-threat-research/2025/02/18/qualys-tru-discovers-two-vulnerabilities-in-openssh-cve-2025-26465-cve-2025-26466

[Issue Tracking] https://bugzilla.suse.com/show_bug.cgi?id=1237040

[Patch] https://ftp.openbsd.org/pub/OpenBSD/patches/7.6/common/008_ssh.patch.sig

[Third Party Advisory] https://lists.debian.org/debian-lts-announce/2025/02/msg00020.html

[Third Party Advisory] https://lists.mindrot.org/pipermail/openssh-unix-announce/2025-February/000161.html

[Third Party Advisory] https://security-tracker.debian.org/tracker/CVE-2025-26465

[Third Party Advisory] https://security.netapp.com/advisory/ntap-20250228-0003/

[Third Party Advisory] https://ubuntu.com/security/CVE-2025-26465

[Release Notes] https://www.openssh.com/releasenotes.html#9.9p2

[Mailing List, Third Party Advisory] https://www.openwall.com/lists/oss-security/2025/02/18/1

[Mailing List, Third Party Advisory] https://www.openwall.com/lists/oss-security/2025/02/18/4

[Press/Media Coverage] https://www.theregister.com/2025/02/18/openssh_vulnerabilities_mitm_dos/

[Third Party Advisory] https://www.vicarius.io/vsociety/posts/cve-2025-26465-detect-vulnerable-openssh

[Mitigation, Third Party Advisory] https://www.vicarius.io/vsociety/posts/cve-2025-26465-mitigate-vulnerable-openssh

[Vendor Advisory] https://access.redhat.com/errata/RHSA-2025:16823

[Vendor Advisory] https://access.redhat.com/errata/RHSA-2025:3837

[Vendor Advisory] https://access.redhat.com/errata/RHSA-2025:6993

... and 5 more

Scores

CVSS v3 6.8

EPSS 0.5867

EPSS Percentile 98.2%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Classification

CWE

CWE-390

Status published

Affected Products (10)

openbsd/openssh < 9.8

openbsd/openssh

openbsd/openssh

openbsd/openssh

netapp/active_iq_unified_manager

netapp/ontap

redhat/openshift_container_platform

debian/debian_linux

debian/debian_linux

redhat/enterprise_linux

Timeline

Published Feb 18, 2025

Tracked Since Feb 18, 2026