CVE-2026-20230

HIGHCVSS 8.6Known Exploited

CISA Known Exploited Vulnerability

https://www.cisco.com/c/en/us/support/docs/csa/cisco-sa-cucm-ssrf-cXPnHcW.html ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-20230

Remediation deadline: June 28, 2026

Description

Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) contain a server-side request forgery (SSRF) Vulnerability that could allow an unauthenticated, remote attacker to write files to the underlying operating system that could be used later to elevate to root.

Timeline

Published:June 3rd, 2026 6:16 PM

Last modified:October 7th, 2026 7:17 PM

Added to KEV:June 25th, 2026

CVSS Scoring

CVSS v3: 8.6 (HIGH)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Affected Software

From NVD CPE configuration data

Vendors

cisco

Products

unified_communications_manager

Weaknesses (CWE)

CWE-918

References & Reports

Advisories, patches, and third-party reports

Source: NIST NVD · Data may lag official sources by up to one minute