Risk Letters

Exploited vulnerability

CVE-2026-20230

TLP:CLEAR

Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) Vulnerability

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.

Facts

  • Vendor: Cisco
  • Product: Unified Communications Manager
  • CVSS: 8.6
  • EPSS (probability of exploitation within 30 days): 88.5 %
  • On CISA's Known Exploited Vulnerabilities list since: 25 June 2026
  • First known exploitation: 25 June 2026
  • CISA's deadline for US federal agencies: 28 June 2026
  • Weakness: CWE-918
  • First seen by Risk Letters: 3 June 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD