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Openssh: machine-in-the-middle attack if verifyhostkeydns is enabled

OpenSSH · CVE-2025-26465
0 news outlets0 CERTs and agencies0 researchers

What is it?

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.

Evidence

No coverage recorded yet.

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
6.8
EPSS
7.7%
First seen
10 h ago
Status
corroborated

All OpenSSH vulnerabilities