CVE-2024-20253: Cisco Unified Communications Manager

Critical severity, CVSS 10.0. EPSS: 2.4% chance of exploitation in the next 30 days.

A vulnerability in multiple Cisco Unified Communications and Contact Center Solutions products could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to the improper processing of user-provided data that is being read into memory. An attacker could exploit this vulnerability by sending a crafted message to a listening port of an affected device. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system with the privileges of the web services user. With access to the underlying operating system, the attacker could also establish root access on the affected device.

Affected products

• Cisco Unified Communications Manager: before 12.5\(1\)su8 (fixed in 12.5\(1\)su8); from 14.0, before 14su3 (fixed in 14su3)
• Cisco Unified Communications Manager Im And Presence Service: before 12.5\(1\)su8 (fixed in 12.5\(1\)su8); from 14.0, before 14.0su3 (fixed in 14.0su3)
• Cisco Unified Contact Center Express: version 12.5(1) only
• Cisco Unity Connection: before 12.5\(1\)su8 (fixed in 12.5\(1\)su8); from 14.0, before 14su3 (fixed in 14su3)
• Cisco Virtualized Voice Browser: version 12.5(1) only; version 12.6(1) only; version 12.6(2) only

Published 2024-01-26. Last modified 2026-06-17.