CVE-2025-20139 Denial of service in Cisco Enterprise Chat and Email

High 7.5 Published 2 Apr 2025 Updated 2 Apr 2025

Unauthenticated remote attackers can cause a denial of service in Cisco Enterprise Chat and Email by sending malicious requests to chat entry points.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-20139?

CVE-2025-20139 is a high-severity denial of service vulnerability in Cisco Enterprise Chat and Email, published on 2 Apr 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-185

Which versions are affected by CVE-2025-20139?

It affects 1 product.

Products include Cisco Enterprise Chat and Email.

How do I fix CVE-2025-20139?

No fix has been published for CVE-2025-20139 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2025-20139 being exploited?

There is no known exploitation of CVE-2025-20139 in the wild and no public exploit code.

Sources

Also known as GHSA-rx2w-x63r-4r67.