VULNERABILITY INTELLIGENCE

CVE-2025-26466

CVSS score5.9 MEDIUM
EPSS probability38.68%
CISA KEVNot currently listed
Published2025-02-28
Last modified2026-10-21
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong packet is allocated in a memory buffer and stored in a queue of packages. It is only freed when the server/client key exchange has finished. A malicious client may keep sending such packages, leading to an uncontrolled increase in memory consumption on the server side. Consequently, the server may become unavailable, resulting in a denial of service attack.

Weakness classification

  • secalert@redhat.com: CWE-770
  • nvd@nist.gov: CWE-770

Primary references