Cisco Patches Critical Zero-Day in Unified Communications and Webex Calling

Cisco Patches Critical Zero-Day in Unified Communications and Webex Calling

First seen 23 Jan 2026, 22:10 UTC •Securityaffairs.CoTechworm •90.3

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Cisco has addressed a critical zero-day remote code execution vulnerability (CVE-2026-20045) in its Unified Communications and Webex Calling platforms. This flaw, which has a CVSS score of 8.2, is actively exploited by unauthenticated remote attackers to execute arbitrary commands. Users of these services are advised to apply the patch promptly.

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