Exploited vulnerability · CISA KEV

Is CVE-2026-20230 exploited? Yes: in CISA KEV since 25 Jun 2026

Gociux · Cisco Unified Communications Manager · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-20230, Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 25 Jun 2026, 22 days after it was published. It affects Cisco Unified Communications Manager. If you run it, CISA's required action is: 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.

What it is

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.

What to do

1. Check whether you run it. Look for Unified Communications Manager in your asset inventory, including appliances and cloud images. Stack check lists every exploited Cisco CVE at once.
2. Apply the fix. 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.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 3 Jun 2026.
4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

Other exploited CVEs in Unified Communications Manager

• CVE-2026-20045: Cisco Unified Communications Products Code Injection Vulnerability (21 Jan 2026)

References

• www.cisco.com/c/en/us/support/docs/csa/cisco-sa-cucm-ssrf-cXPnHcW.html
• nvd.nist.gov/vuln/detail/CVE-2026-20230

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in June 2026 · Cisco scorecard · act-now radar.