Cisco Unified Computing System Remote Code Execution Vulnerability (regreSSHion) (cisco cisco-sa-openssh-rce-2024)

high Nessus Plugin ID 312163

Synopsis

The remote device is missing a vendor-supplied security patch.

Description

According to its self-reported version, Cisco Unified Computing System is affected by a vulnerability.

- A remote code execution vulnerability exists in Cisco Unified Computing System due to a signal handler race condition found in sshd, where a client does not authenticate within LoginGraceTime seconds, after which the sshd SIGALRM handler is called asynchronously. An unauthenticated, remote attacker can exploit this to call various functions that are not async-signal-safe with root privileges. (CVE-2024-6387)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

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

Solution

Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCwk79616, CSCwk78644, CSCwk62266, CSCwk62723.

Plugin Details

Severity: High

ID: 312163

File Name: cisco-sa-openssh-rce-2024-ucs.nasl

Version: 1.1

Type: Remote

Family: CISCO

Published: 5/5/2026

Updated: 5/5/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.0

CVSS v2

Risk Factor: High

Base Score: 7.6

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

CVSS Score Source: CVE-2024-6387

CVSS v3

Risk Factor: High

Base Score: 8.1

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

Vulnerability Information

CPE: cpe:/o:cisco:unified_computing_system_central

Required KB Items: installed_sw/Cisco UCS Central WebUI, Settings/ParanoidReport

Patch Publication Date: 7/1/2024

Vulnerability Publication Date: 7/1/2024

Reference Information

CVE: CVE-2024-6387

CISCO-SA: cisco-sa-openssh-rce-2024

IAVA: 2024-A-0375-S

CISCO-BUG-ID: CSCwk62266, CSCwk62723, CSCwk78644, CSCwk79616

Detections

Analytics