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CVE-2026-20045: Cisco Unified Communications Products Code Injection Vulnerability

criticalknown exploitedCVE-2026-20045
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P), Cisco Unity Connection, and Cisco Webex Calling Dedicated Instance contain a code injection vulnerability that could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges to root.

CSIRTS triage

vendor: Ciscoproduct: Unified Communications ProductsCode injectionPrivilege escalation
What
The vulnerability allows an attacker to obtain user-level access and potentially elevate privileges to root through code injection.
Who is affected
Users of Cisco Unified Communications Manager and related products are affected.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Install the security updates provided by Cisco immediately.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-01-21
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-20045

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-20045coverage & exploitation statusNVD · CVE.org

Recent advisories for Cisco Unified Communications

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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