# CVE-2026-20045: Cisco Unified Communications Products Remote Code Execution Vulnerability

> CVE-2026-20045: Cisco Unified Communications Products Remote Code Execution Vulnerability. CVSS 8.2 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2026-20045
Last updated: 2026-06-17T10:16:58Z

- Published: 2026-01-21 16:26 UTC · Updated: 2026-06-17 10:16 UTC · Assigner: cisco
- CVSS: 8.2 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
- EPSS: 4.5%, 92th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-01-21, federal due date 2026-02-11, ransomware use: Unknown
- CWE: CWE-94

## Description

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.

## CISA required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

## Affected vendors and products

- Cisco: Cisco Unified Communications Manager
- Cisco: Cisco Unified Communications Manager IM and Presence Service
- Cisco: Cisco Unity Connection

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-20045)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-20045)
- [https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voice-rce-mORhqY4b](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-voice-rce-mORhqY4b)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-20045 · Markdown: https://rewindex.com/cve/CVE-2026-20045.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-20045 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:00:10.471Z