CVE-2026-20045

Basic Information

CVE State

PUBLISHED

Reserved Date

October 08, 2025

Published Date

January 21, 2026

Last Updated

February 26, 2026

Vendor

Cisco

Product

Cisco Unified Communications Manager, Cisco Unified Communications Manager IM and Presence Service, Cisco Unity Connection

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.

Tags

cisa

CVSS Scores

SSVC Information

Exploitation

active

Automatable

Yes

Technical Impact

total

Exploit Status

Exploited in the Wild

Yes (2026-06-01 10:49:29 UTC) Source

Proof of Concept Available

Yes (added 2026-01-25 01:01:31 UTC) Source