CVE-2026-20230 remediation guide

Cisco Cisco Unified Communications Manager, unified communications manager

A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an unauthenticated, remote attacker to conduct server-side request forgery (SSRF) attacks through an affected device. This vulnerability is due to improper input validation for specific HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to write files to the underlying operating system that could be used later to elev...

Open CVE record

ProductCisco Cisco Unified Communications Manager, unified communications manager

Affected versions>= 14, >= 14SU1, >= 14SU2, >= 14SU3, >= 15, >= 15SU1, >= 14SU4, >= 14SU4a, >= 15SU1a, >= 15SU2, >= 15.0.1.13010-1, >= 15.0.1.13011-1, >= 15.0.1.13012-1, >= 15.0.1.13013-1, >= 15.0.1.13014-1, >= 15.0.1.13015-1, >= 15.0.1.13016-1, >= 15.0.1.13017-1, >= 15SU3a, >= 14SU5

Fixed versions14su6

Priority basisImmediate · CVSS 8.6 · EPSS 83.2%

Identify the affected asset

Confirm whether Cisco Cisco Unified Communications Manager, unified communications manager is installed, record the deployed version and installation path, and identify exposed interfaces.

Record the product name, package or appliance identifier, and installed version.
Identify internet-facing, administrative, API, and internal access paths.
Preserve the pre-change configuration and relevant service logs.

Validate the affected-version match

Compare the deployed version with the affected range: >= 14, >= 14SU1, >= 14SU2, >= 14SU3, >= 15, >= 15SU1, >= 14SU4, >= 14SU4a, >= 15SU1a, >= 15SU2, >= 15.0.1.13010-1, >= 15.0.1.13011-1, >= 15.0.1.13012-1, >= 15.0.1.13013-1, >= 15.0.1.13014-1, >= 15.0.1.13015-1, >= 15.0.1.13016-1, >= 15.0.1.13017-1, >= 15SU3a, >= 14SU5. Treat incomplete inventory results as unresolved.

Prioritize with independent signals

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog. Combine this signal with asset criticality, exposure, compensating controls, and business impact.

Apply supported remediation

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Verify the result

Confirm the resulting version, service health, authentication and access paths, monitoring coverage, and relevant security logs.

Confirm the expected version and package state.
Run a functional health check for critical service paths.
Review authentication, error, application, and security monitoring logs.
Reassess exposure if the supported fix cannot be applied.

Operational boundary

This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.