CVE-2026-20045

HIGH8.2

CISA KEV

Published 2026-01-21 · Updated 2026-06-17 · Source psirt@cisco.com

Summary

CVE-2026-20045 is a high-severity (CVSS 8.2) vulnerability in Cisco Unified Communications Manager. CISA added it to the Known Exploited Vulnerabilities catalog on January 21, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by February 11, 2026. CISA does not currently list it as used in ransomware campaigns. Cisco has 102 vulnerabilities in the KEV catalog, 7 of them linked to ransomware.

All 102 known-exploited Cisco vulnerabilities →

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.

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

CWE-94

CISA Known-Exploited Vulnerability

Product: Cisco — Unified Communications Manager

Name: Cisco Unified Communications Products Code Injection Vulnerability

Date added: 2026-01-21 · Due: 2026-02-11

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.

References

View on NVD

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