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.
History

Wed, 05 Mar 2025 04:45:00 +0000


Tue, 04 Mar 2025 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 28 Feb 2025 22:45:00 +0000

Type Values Removed Values Added
References

Fri, 28 Feb 2025 21:30:00 +0000

Type Values Removed Values Added
Title openssh: Denial-of-service in OpenSSH Openssh: denial-of-service in openssh
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
CPEs cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat openshift
References

Wed, 19 Feb 2025 14:00:00 +0000

Type Values Removed Values Added
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.
Title openssh: Denial-of-service in OpenSSH
Weaknesses CWE-400
References
Metrics threat_severity

None

cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Moderate


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2025-02-28T21:25:28.861Z

Updated: 2025-03-05T03:48:43.236Z

Reserved: 2025-02-10T18:31:47.979Z

Link: CVE-2025-26466

cve-icon Vulnrichment

Updated: 2025-02-28T22:02:51.403Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2025-02-28T22:15:40.080

Modified: 2025-03-05T04:15:12.127

Link: CVE-2025-26466

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-02-18T00:00:00Z

Links: CVE-2025-26466 - Bugzilla