VULNERABILITY INTELLIGENCE

CVE-2025-26465

CVSS score6.8 MEDIUM
EPSS probability7.72%
CISA KEVNot currently listed
Published2025-02-18
Last modified2026-10-21
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

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.

Weakness classification

  • secalert@redhat.com: CWE-390

Primary references