8.2 High Exploited

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

Active exploitation observed

· CISA KEV catalogue

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.

Ransomware campaigns Not observed so far

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 and versions

Product	Affected versions	Fixed in
Cisco Unified Communications Manager 15.0	15.0.1.13010-1 → 15.0.1.13017-1	No fix stated
Cisco Unified Communications Manager 15	15SU1a → 15	No fix stated
Cisco Unified Communications Manager 14	14SU1 → 14	No fix stated
Cisco Unified Communications Manager IM and Presence Service 15	15SU1 → 15	No fix stated
Cisco Unified Communications Manager IM and Presence Service 14	14SU1 → 14	No fix stated
Cisco Unity Connection 15	15SU1 → 15	No fix stated
Cisco Unity Connection 14	14SU1 → 14	No fix stated