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.

Classification

CVE ID: CVE-2025-26465

Affected Products

Vendor: Red Hat

Product: Red Hat Enterprise Linux 6

Exploit Prediction Scoring System (EPSS)

EPSS Score: 11.5% (probability of being exploited)

EPSS Percentile: 92.7% (scored less or equal to compared to others)

EPSS Date: 2025-03-19 (when was this score calculated)

References

https://access.redhat.com/security/cve/CVE-2025-26465
https://bugzilla.redhat.com/show_bug.cgi?id=2344780

Timeline