#VU121911 Code Injection in Cisco Systems, Inc products - CVE-2026-20045
Published: January 21, 2026 / Updated: February 6, 2026
Vulnerability identifier: #VU121911
Vulnerability risk: Critical
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red
CVE-ID: CVE-2026-20045
CWE-ID: CWE-94
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerable software:
Cisco Unified Communications Manager
Cisco Unified Communications Manager Session Management Edition
Cisco Unified Communications Manager IM & Presence Service
Cisco Unity Connection
Cisco Unified Communications Manager
Cisco Unified Communications Manager Session Management Edition
Cisco Unified Communications Manager IM & Presence Service
Cisco Unity Connection
Software vendor:
Cisco Systems, Inc
Cisco Systems, Inc
Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to improper input validation when handling HTTP requests. A remote attacker can send a specially crafted HTTP request and execute arbitrary code on the target system.
Note, the vulnerability is being actively exploited in the wild.
Remediation
Install updates from vendor's website.