Cisco Fixes Active Unified Communications Zero-Day

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Cisco Fixes Active Unified Communications Zero-Day

Techworm • January 23, 2026

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Cisco has patched a critical zero - day flaw in Unified Communications and Webex Calling that is actively exploited.

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Cisco Patches Critical Zero-Day in Unified Communications and Webex Calling 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. 2 sources 90

Extracted Entities

Attack Types (1)

Zero-day Exploit

Platforms (2)

Unified Communications Webex Calling