CVE-2025-20309 CRITICAL

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

Vendor Cisco
Product Cisco Unified Communications Manager
Weakness CWE-798 · Hardcoded credentials
Published July 2, 2025
Last update February 26, 2026

CVSS base score

10.0/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

July 2, 2025 CVE published
February 26, 2026 Record updated