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

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.

Published: 2025-07-02 Last update: 2025-07-03 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-20309 is rated Moderate Risk (64.8/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.60%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-20309

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-28 0.16% 0.60% +0.44%
2 2025-12-10 0.12% 0.16% +0.04%
3 2025-11-28 — 0.12% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-20309

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
10.0 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 6.0 [email protected]

Weakness enumeration for CVE-2025-20309

Affected software / configurations for CVE-2025-20309

Vendor Product Version Raw CPE
cisco unified_communications_manager 15.0.1.13010-1 cpe:2.3:a:cisco:unified_communications_manager:15.0.1.13010-1:*:*:*:-:*:*:*
cisco unified_communications_manager 15.0.1.13010-1 cpe:2.3:a:cisco:unified_communications_manager:15.0.1.13010-1:*:*:*:session_management:*:*:*
cisco unified_communications_manager 15.0.1.13011-1 cpe:2.3:a:cisco:unified_communications_manager:15.0.1.13011-1:*:*:*:-:*:*:*
cisco unified_communications_manager 15.0.1.13011-1 cpe:2.3:a:cisco:unified_communications_manager:15.0.1.13011-1:*:*:*:session_management:*:*:*
cisco unified_communications_manager 15.0.1.13012-1 cpe:2.3:a:cisco:unified_communications_manager:15.0.1.13012-1:*:*:*:-:*:*:*
cisco unified_communications_manager 15.0.1.13012-1 cpe:2.3:a:cisco:unified_communications_manager:15.0.1.13012-1:*:*:*:session_management:*:*:*
cisco unified_communications_manager 15.0.1.13013-1 cpe:2.3:a:cisco:unified_communications_manager:15.0.1.13013-1:*:*:*:-:*:*:*
cisco unified_communications_manager 15.0.1.13013-1 cpe:2.3:a:cisco:unified_communications_manager:15.0.1.13013-1:*:*:*:session_management:*:*:*
cisco unified_communications_manager 15.0.1.13014-1 cpe:2.3:a:cisco:unified_communications_manager:15.0.1.13014-1:*:*:*:-:*:*:*
cisco unified_communications_manager 15.0.1.13014-1 cpe:2.3:a:cisco:unified_communications_manager:15.0.1.13014-1:*:*:*:session_management:*:*:*
cisco unified_communications_manager 15.0.1.13015-1 cpe:2.3:a:cisco:unified_communications_manager:15.0.1.13015-1:*:*:*:-:*:*:*
cisco unified_communications_manager 15.0.1.13015-1 cpe:2.3:a:cisco:unified_communications_manager:15.0.1.13015-1:*:*:*:session_management:*:*:*
cisco unified_communications_manager 15.0.1.13016-1 cpe:2.3:a:cisco:unified_communications_manager:15.0.1.13016-1:*:*:*:-:*:*:*
cisco unified_communications_manager 15.0.1.13016-1 cpe:2.3:a:cisco:unified_communications_manager:15.0.1.13016-1:*:*:*:session_management:*:*:*
cisco unified_communications_manager 15.0.1.13017-1 cpe:2.3:a:cisco:unified_communications_manager:15.0.1.13017-1:*:*:*:-:*:*:*
cisco unified_communications_manager 15.0.1.13017-1 cpe:2.3:a:cisco:unified_communications_manager:15.0.1.13017-1:*:*:*:session_management:*:*:*

References for CVE-2025-20309

cvelogic Threat Intelligence