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OpenSSH < 9.9p2 DoS

high Nessus Plugin ID 216475

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Synopsis

The SSH server running on the remote host is affected by a denial of service vulnerability.

Description

The version of OpenSSH installed on the remote host is prior to 9.9p2. It is, therefore, affected by a vulnerability as referenced in the release-9.9p2 advisory. sshd(8) in OpenSSH versions 9.5p1 to 9.9p1 (inclusive) is vulnerable to a memory/CPU denial-of-service related to the handling of SSH2_MSG_PING packets. This condition may be mitigated using the existing PerSourcePenalties feature.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to OpenSSH version 9.9p2 or later.

See Also

https://www.openssh.com/txt/release-9.9p2

Plugin Details

Severity: High

ID: 216475

File Name: openssh_9_9_p2_cve-2025-26466.nasl

Version: 1.2

Type: remote

Family: Misc.

Published: 2/19/2025

Updated: 2/20/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2025-26466

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Required KB Items: installed_sw/OpenSSH

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2/18/2025

Vulnerability Publication Date: 2/18/2025

Reference Information

CVE: CVE-2025-26466