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CVE-2026-20045: Cisco Unified Communications Products Code Injection Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-01-21
• EPSS: 4.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-21 · updated 2026-06-17
• Weakness: CWE-94

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.

Affected products

• Cisco Unified Communications Manager: from 12.5 before 14su5; from 15.0 through 15su3a — fixed in 14su5
• Cisco Unified Communications Manager IM and Presence Service: from 12.5 before 14su5; from 15.0 through 15su3a — fixed in 14su5
• Cisco Unity Connection: from 12.5 before 14su5; from 15.0 through 15su3 — fixed in 14su5

How to fix

Upgrade to a fixed version: Cisco Unified Communications Manager 14su5; Cisco Unified Communications Manager IM and Presence Service 14su5; Cisco Unity Connection 14su5. Check the vendor advisory for mitigations.

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voice-rce-mORhqY4b
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20045

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