SB2026012157 - Unauthenticated remote code execution in Cisco Unified Communications products
Published: January 21, 2026 Updated: February 6, 2026
Security Bulletin ID
SB2026012157
Severity
Critical
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Code Injection (CVE-ID: CVE-2026-20045)
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 update from vendor's website.