Unified Communications Manager
CVE-2026-20045
HIGH
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
3DescriptionCVE.org
A vulnerability in 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 could allow an unauthenticated, remote attacker to execute arbitrary commands on the underlying operating system of an affected device.
This vulnerability is due to improper validation of user-supplied input in HTTP requests. An attacker could exploit this vulnerability by sending a sequence of crafted HTTP requests to the web-based management interface of an affected device. A successful exploit could allow the attacker to obtain user-level access to the underlying operating system and then elevate privileges to root. Note: Cisco has assigned this security advisory a Security Impact Rating (SIR) of Critical rather than High as the score indicates. The reason is that exploitation of this vulnerability could result in an attacker elevating privileges to root.
AnalysisAI
Cisco Unified Communications Manager and related products contain a code injection vulnerability (CVE-2026-20045) that allows unauthenticated remote attackers to execute arbitrary code. This KEV-listed vulnerability affects the core enterprise voice/video infrastructure including Unified CM, IM&P, Unity Connection, and Webex Calling Dedicated Instance, making it a high-priority threat for organizations dependent on Cisco collaboration tools.
Technical ContextAI
The vulnerability exists in the web management interface shared across multiple Cisco collaboration products. Insufficient input validation allows an unauthenticated remote attacker to inject and execute arbitrary code on the underlying operating system. These products form the backbone of enterprise voice, video, and instant messaging infrastructure, and typically have broad network accessibility for management purposes.
RemediationAI
Apply Cisco security updates immediately. Restrict management interface access to trusted admin networks. Monitor for suspicious web requests to Unified CM management ports. Review call detail records and audit logs for signs of compromise.
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Same weakness CWE-94 – Code Injection
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External POC / Exploit Code
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