CVE-2025-20309 Cisco Unified Communications Manager Static SSH Credentials Vulnerability

Critical 10.0 Published 2 Jul 2025 Updated 26 Feb 2026

Unauthenticated remote attackers can log in as root using static credentials to execute arbitrary commands on Cisco Unified Communications Manager systems.

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-2025-20309?

CVE-2025-20309 is a critical vulnerability in Cisco Unified Communications Manager, published on 2 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an unauthenticated, remote attacker to log in to an affected device using the root account, which has default, static credentials that cannot be changed or deleted. This vulnerability is due to the presence of static user credentials for the root account that are reserved for use during development. An attacker could exploit this vulnerability by using the account to log in to an affected system. A successful exploit could allow the attacker to log in to the affected system and execute arbitrary commands as the root user.

Weakness: CWE-798

Which versions are affected by CVE-2025-20309?

It affects 1 product.

Products include Cisco Unified Communications Manager.

How do I fix CVE-2025-20309?

No fix has been published for CVE-2025-20309 yet. Limit exposure of the affected software until one is available.

Is CVE-2025-20309 being exploited?

There is no known exploitation of CVE-2025-20309 in the wild and no public exploit code.

All Cisco Unified Communications Manager vulnerabilities

Sources

Also known as GHSA-3q7w-9xf2-2f3g.