CVE-2026-20045

CVE Enrichment

CVSS: 9.8 CRITICAL
EPSS: 4.54%
EPSS Percentile: 91.36%
CISA KEV: YES — Known Exploited Vulnerability

Description

A vulnerability in Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P), Cisco Unity Connection, and Cisco Webex Calling Dedicated Instance could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device.  This vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by sending a sequence of crafted HTTP requests to the web-based management interface of an affected device. A successful exploit could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges to root.  Note: Cisco has assigned this security advisory a Security Impact Rating (SIR) of Critical rather than High as the score indicates. The reason is that exploitation of this vulnerability could result in an attacker elevating privileges to root.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: [email protected]
Published: 22-Jan-2026 00:16
Last Modified: 17-Jun-2026 17:16
EPSS Date: 2026-10-12
CWE: CWE-94

CVSS Vector


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

CISA KEV Details

Date Added: 2026-01-21
Remediation Due: 2026-02-11
Known Ransomware Campaign Use: Unknown
Required Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voice-rce-mORhqY4b ; https://nvd.nist.gov/vuln/detail/CVE-2026-20045

Affected Products / Versions

cisco / unified_communications_manager
Version / affected range: * · from (inclusive) 12.5 · before (exclusive) 14su5
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:*
cisco / unified_communications_manager
Version / affected range: * · from (inclusive) 12.5 · before (exclusive) 14su5
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:*
cisco / unified_communications_manager
Version / affected range: * · from (inclusive) 15.0 · through (inclusive) 15su3a
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:-:*:*:*
cisco / unified_communications_manager
Version / affected range: * · from (inclusive) 15.0 · through (inclusive) 15su3a
cpe:2.3:a:cisco:unified_communications_manager:*:*:*:*:session_management:*:*:*
cisco / unified_communications_manager_im_and_presence_service
Version / affected range: * · from (inclusive) 12.5 · before (exclusive) 14su5
cpe:2.3:a:cisco:unified_communications_manager_im_and_presence_service:*:*:*:*:*:*:*:*
cisco / unified_communications_manager_im_and_presence_service
Version / affected range: * · from (inclusive) 15.0 · through (inclusive) 15su3a
cpe:2.3:a:cisco:unified_communications_manager_im_and_presence_service:*:*:*:*:*:*:*:*
cisco / unity_connection
Version / affected range: * · from (inclusive) 12.5 · before (exclusive) 14su5
cpe:2.3:a:cisco:unity_connection:*:*:*:*:*:*:*:*
cisco / unity_connection
Version / affected range: * · from (inclusive) 15.0 · through (inclusive) 15su3
cpe:2.3:a:cisco:unity_connection:*:*:*:*:*:*:*:*

References

Last enrichment sync: 24-Oct-2026 05:13
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

CVE-2026-20045 Q1 2026 Threat Review Details Risks Facing U.S. Public Sector

CVE (5)

Threat Actors (2)

Vendors (7)

Products (6)

Tools (1)

Industries (4)

Countries (2)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.