CVE-2025-20139: Cisco Enterprise Chat And Email

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

A vulnerability in chat messaging features of Cisco Enterprise Chat and Email (ECE) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper validation of user-supplied input to chat entry points. An attacker could exploit this vulnerability by sending malicious requests to a messaging chat entry point in the affected application. A successful exploit could allow the attacker to cause the application to stop responding, resulting in a DoS condition. The application may not recover on its own and may need an administrator to manually restart services to recover.

Affected products

• Cisco Enterprise Chat And Email: before 12.6\(1\)es10 (fixed in 12.6\(1\)es10)

Published 2025-04-02. Last modified 2026-06-17.