CVE-2025-20309

Name: CVE-2025-20309
Creator: NVD / NIST
Published: 2025-07-02T17:15:52.927+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 10/10EPSS 1.06%

Last modified Jun 17, 2026

CVE-2025-20309 is a critical-severity vulnerability rated 10/10 on the CVSS scale. 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. EPSS estimates a 1.06% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

10/10

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

EPSS Probability

1.06%

60.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-798

Affected Software

Vendor	Product	Versions
Cisco	Unified Communications Manager	15.0.1.13010-1
Cisco	Unified Communications Manager	15.0.1.13011-1
Cisco	Unified Communications Manager	15.0.1.13012-1
Cisco	Unified Communications Manager	15.0.1.13013-1
Cisco	Unified Communications Manager	15.0.1.13014-1
Cisco	Unified Communications Manager	15.0.1.13015-1
Cisco	Unified Communications Manager	15.0.1.13016-1
Cisco	Unified Communications Manager	15.0.1.13017-1

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-ssh-m4UBdpE7Patch, Vendor Advisory

Timeline

Published: Jul 2, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-20309?

How severe is CVE-2025-20309?

CVE-2025-20309 has a CVSS score of 10/10 (CRITICAL severity). The EPSS model estimates a 1.06% probability of exploitation in the next 30 days.

How do I fix CVE-2025-20309?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-20309?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST