CVE-2025-26466

MEDIUM EPSS 98.4%
Published Feb 28, 20251y ago · Modified Jun 17, 20261w ago
5.9 CVSS 3.1
Medium
Find Similar
Published Feb 28, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.9
Exploitability
2.2
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
98.4% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-770

Affected Products 14

VendorProductVersionRange
openbsdopenssh9.5any
openbsdopenssh9.6any
openbsdopenssh9.6any
openbsdopenssh9.7any
openbsdopenssh9.7any
openbsdopenssh9.8any
openbsdopenssh9.8any
openbsdopenssh9.9any
openbsdopenssh9.9any
canonicalubuntu_linux24.04any
canonicalubuntu_linux24.10any
debiandebian_linux11.0any
debiandebian_linux12.0any
debiandebian_linux13.0any

References 15

  • seclists.org http://seclists.org/fulldisclosure/2025/Feb/18
  • seclists.org http://seclists.org/fulldisclosure/2025/May/7
  • seclists.org http://seclists.org/fulldisclosure/2025/May/8
  • access.redhat.com https://access.redhat.com/security/cve/CVE-2025-26466
    Third Party Advisory
  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2345043
    Issue Tracking
  • bugzilla.suse.com https://bugzilla.suse.com/show_bug.cgi?id=1237041
    Third Party Advisory
  • seclists.org https://seclists.org/oss-sec/2025/q1/144
  • security-tracker.debian.org https://security-tracker.debian.org/tracker/CVE-2025-26466
    Third Party Advisory
  • security.netapp.com https://security.netapp.com/advisory/ntap-20250228-0002/
    Third Party Advisory
  • ubuntu.com https://ubuntu.com/security/CVE-2025-26466
    Third Party Advisory
  • openwall.com https://www.openwall.com/lists/oss-security/2025/02/18/1
    Mailing ListThird Party Advisory
  • openwall.com https://www.openwall.com/lists/oss-security/2025/02/18/4
    Mailing ListThird Party Advisory
  • qualys.com https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt
    Third Party Advisory
  • vicarius.io https://www.vicarius.io/vsociety/posts/cve-2025-26466-detection-script-memory-consumption-vulnerability-in-openssh
  • vicarius.io https://www.vicarius.io/vsociety/posts/cve-2025-26466-mitigation-script-memory-consumption-vulnerability-in-openssh

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.