CVE-2026-20045
Cisco Unified Communications Products Remote Code Execution Vulnerability
Cisco·Unified Communications Manager
- Added
- Jan 21, 2026
- Fix due
- Feb 11, 2026
- Ransomware
- Not known
- Published
- Jan 21, 2026
- Updated
- Feb 26, 2026
- First covered
- Jul 3, 2026
- Latest story
- 4 months ago
Summary
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.
CWE-94Improper Control of Generation of Code ('Code Injection')
Attack profile
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:NCISA 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.
Affected products
- Cisco Unified Communications Manager12.5(1)SU212.5(1)SU112.5(1)12.5(1)SU3
- Cisco Unified Communications Manager IM and Presence Service12.5(1)12.5(1)SU112.5(1)SU212.5(1)SU3
- Cisco Unity Connection12.5(1)12.5(1)SU112.5(1)SU212.5(1)SU3