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Cisco Unified Communications Zero

Gbhackers •Varshini • January 22, 2026

Cisco has warned customers of a critical zero-day vulnerability affecting several of its Unified Communications products, including Cisco Unified Communications Manager (Unified CM), Unified Communications Manager Session Management Edition (Unified CM SME), Unified Communications Manager IM & Presence Service (IM&P), Cisco Unity Connection, and Cisco Webex Calling Dedicated Instance. Tracked as CVE-2026-20045, the vulnerability carries […]

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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 Issues Warning for Critical Zero-Day Vulnerability in Unified Communications Cisco has disclosed a critical zero-day remote code execution vulnerability, CVE-2026-20045, affecting multiple Unified Communications products. This flaw allows unauthenticated attackers to execute arbitrary commands on the underlying operating system, potentially gaining root access. The Cisco Product Security Incident Response Team (PSIRT) has confirmed active exploitation attempts and urges immediate patching. 4 sources 84

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Cisco Unified Communications Zero

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