CVE-2018-0409: Cisco Telepresence Video Communication Server

High severity, CVSS 7.5. EPSS: 3.5% chance of exploitation in the next 30 days.

A vulnerability in the XCP Router service of the Cisco Unified Communications Manager IM & Presence Service (CUCM IM&P) and the Cisco TelePresence Video Communication Server (VCS) and Expressway could allow an unauthenticated, remote attacker to cause a temporary service outage for all IM&P users, resulting in a denial of service (DoS) condition. The vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending a malicious IPv4 or IPv6 packet to an affected device on TCP port 7400. An exploit could allow the attacker to overread a buffer, resulting in a crash and restart of the XCP Router service. Cisco Bug IDs: CSCvg97663, CSCvi55947.

Affected products

• Cisco Telepresence Video Communication Server: version x7.0.1 only; version x7.2.4 only; version x8.1 only; version x8.2.2 only; version x8.5 only; version x8.6 only; …
• Cisco Unified Communications Manager Im And Presence Service: version 11.5 only; version 11.5(1) only

Published 2018-08-15. Last modified 2026-06-17.