Detections
Analytics
Cisco IOS Software Extensible Messaging Client Protocol DoS (cisco-sa-ios-xmcp-thbAr34t)
high Nessus Plugin ID 333311
Synopsis
The remote device is affected by a denial of service vulnerability.Description
According to its self-reported version, Cisco IOS is affected by a denial of service vulnerability. A flaw exists in the Extensible Messaging Client Protocol (XMCP) due to improper handling of malformed XMCP packets. An unauthenticated, remote attacker can exploit this issue, via a malformed XMCP packet, to cause the system to stop responding.Please see the included Cisco BIDs and Cisco Security Advisory for more information.
Solution
Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwu20827See Also
Plugin Details
Severity: High
ID: 333311
File Name: cisco-sa-ios-xmcp-thbAr34t-ios.nasl
Version: 1.1
Type: Combined
Family: CISCO
Published: 8/7/2026
Updated: 8/7/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.3
Percentile: 51.03
CVSS v2
Risk Factor: High
Base Score: 7.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS Score Source: CVE-2026-20301
CVSS v3
Risk Factor: High
Base Score: 8.6
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Vulnerability Information
CPE: cpe:/o:cisco:ios
Required KB Items: Host/Cisco/IOS/Version
Patch Publication Date: 8/5/2026
Vulnerability Publication Date: 8/5/2026
Reference Information
CVE: CVE-2026-20301