CVE-2025-20276 Cisco Unified Contact Center Express Remote Code Execution Vulnerability

Low 3.8 Published 4 Jun 2025 Updated 26 Feb 2026

Authenticated attackers can execute arbitrary code and escalate privileges via insecure Java deserialization in Cisco Unified CCX.

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

What is CVE-2025-20276?

CVE-2025-20276 is a low-severity unsafe deserialization vulnerability in Cisco Unified Contact Center Express, published on 4 Jun 2025. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

A vulnerability in the web-based management interface of Cisco Unified CCX could allow an authenticated, remote attacker to execute arbitrary code on an affected device. To exploit this vulnerability, the attacker must have valid administrative credentials.  This vulnerability is due to insecure deserialization of Java objects by the affected software. An attacker could exploit this vulnerability by sending a crafted Java object to an affected device. A successful exploit could allow the attacker to execute arbitrary code on the underlying operating system of an affected device as a low-privilege user. A successful exploit could also allow the attacker to undertake further actions to elevate their privileges to root.

Weakness: CWE-502

Which versions are affected by CVE-2025-20276?

It affects 1 product.

Products include Cisco Unified Contact Center Express.

How do I fix CVE-2025-20276?

No fix has been published for CVE-2025-20276 yet. Limit exposure of the affected software until one is available.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2025-20276 being exploited?

There is no known exploitation of CVE-2025-20276 in the wild and no public exploit code.

Sources

Also known as GHSA-v453-hjcv-294p.