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OpenSSH < 9.9p2 DoS

medium 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: Medium

ID: 216475

File Name: openssh_9_9_p2_cve-2025-26466.nasl

Version: 1.5

Type: remote

Family: Misc.

Published: 2/19/2025

Updated: 3/12/2025

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.1

CVSS v2

Risk Factor: High

Base Score: 7.1

Temporal Score: 5.6

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

CVSS Score Source: CVE-2025-26466

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.3

Vector: CVSS:3.0/AV:N/AC:H/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: Settings/ParanoidReport, 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

IAVA: 2025-A-0126