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High8.2Vendor: CriticalCisco Exploited CISA KEV

High [CVE-2026-20045] Cisco Unified Communications Products Remote Code Execution Vulnerability

This high-severity Cisco advisory covers CVE-2026-20045 affecting Cisco Unity Connection, Cisco Unified Communications Manager IM and Presence Service, Webex.

cisco-sa-voice-rce-mORhqY4b Published Jan 21, 2026Updated by vendor Feb 13, 2026
CVE-2026-20045
Affected products & platforms
CiscoUnified CommunicationsWebex
Open vendor advisory

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Summary

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 craf…

Affected products named by the advisory: Cisco Unified Communications Manager IM and Presence Service.

CISA Known Exploited Vulnerability

Listed:
Jan 21, 2026 · federal remediation due Feb 11, 2026
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.
Ransomware use:
Unknown

KEV is a prioritization signal from CISA — remediation detail still comes from the vendor advisory.

Affected versions
  • Scope: This vulnerability affects the following Cisco products, regardless of device configuration:
  • 12.5 — Migrate to a fixed release
  • Release 14 (first fixed: 14SU5 or apply patch file:1)
  • Release ciscocm.CSCwr21851_Remote_Code_Execution_v1.zip (first fixed: 15)
  • Release 15SU4 or apply patch file:1 (first fixed: ciscocm.CSCwr21851_Remote_Code_Execution_v1.zip)
  • 12.5 — Migrate to a fixed release
  • Release 14 (first fixed: 14SU5 or apply patch file:1)
  • Release ciscocm.cuc.CSCwr29208_C0266-v2.zip (first fixed: 15)
  • Release 15SU4 (Mar 2026) or apply patch file:1 (first fixed: ciscocm.cuc.CSCwr29208_C0266-v2.zip)

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions
  • 14SU5 or apply patch file:1
  • 15
  • ciscocm.CSCwr21851_Remote_Code_Execution_v1.zip
  • ciscocm.cuc.CSCwr29208_C0266-v2.zip

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory.
  • Release 12.5: migrate to a fixed release.
  • Release 14: upgrade to 14SU5 or apply patch file:1.
  • Release ciscocm.CSCwr21851_Remote_Code_Execution_v1.zip: upgrade to 15.
  • Release 15SU4 or apply patch file:1: upgrade to ciscocm.CSCwr21851_Remote_Code_Execution_v1.zip.
  • Release 12.5: migrate to a fixed release.
  • Release 14: upgrade to 14SU5 or apply patch file:1.
  • Release ciscocm.cuc.CSCwr29208_C0266-v2.zip: upgrade to 15.
  • Release 15SU4 (Mar 2026) or apply patch file:1: upgrade to ciscocm.cuc.CSCwr29208_C0266-v2.zip.
Workaround status
  • There are no workarounds that address this vulnerability.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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