CVE-2024-20375: Cisco Unified Communications Manager

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

A vulnerability in the SIP call processing function of Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper parsing of SIP messages. An attacker could exploit this vulnerability by sending a crafted SIP message to an affected Cisco Unified CM or Cisco Unified CM SME device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition that interrupts the communications of reliant voice and video devices.

Affected products

• Cisco Unified Communications Manager: version 12.0(1)su1 only; version 12.0(1)su2 only; version 12.0(1)su3 only; version 12.0(1)su4 only; version 12.0(1)su5 only; version 12.5(1) only; …

Published 2024-08-21. Last modified 2026-06-17.