CVE-2025-20309

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.

CVSS v3.1 Score

10.0

CRITICAL

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

Weakness Type (CWE)

CWE-798 CWE-798

Affected Products

Vendor	Product	Versions
cisco	unified_communications_manager	All
cisco	unified_communications_manager	All
cisco	unified_communications_manager	All
cisco	unified_communications_manager	All
cisco	unified_communications_manager	All
cisco	unified_communications_manager	All
cisco	unified_communications_manager	All
cisco	unified_communications_manager	All
cisco	unified_communications_manager	All
cisco	unified_communications_manager	All
cisco	unified_communications_manager	All
cisco	unified_communications_manager	All
cisco	unified_communications_manager	All
cisco	unified_communications_manager	All
cisco	unified_communications_manager	All
cisco	unified_communications_manager	All

References

Advisories & Patches

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-ssh-m4UBdpE7

Frequently Asked Questions

What is CVE-2025-20309? +

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. It has a CVSS v3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2025-20309? +

CVE-2025-20309 has a CVSS v3.1 score of 10.0 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-20309? +

CVE-2025-20309 affects products from cisco, specifically: unified_communications_manager. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-20309? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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