SSRF in Cisco Unified Communications Manager
CVE-2026-20230
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 elevate to root. Note: Cisco has assigned this security advisory a Security Impact Rating (SIR) of Critical rather than High as the score indicates. The reason is that exploitation of this vulnerability could result in an attacker elevating privileges to root. Note: To exploit this vulnerability, the WebDialer service must be enabled. WebDialer is disabled by default.
Vulnerability class: SSRF (Server-Side Request Forgery)
EPSS: 0.882 (99.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N.
Affected products
- Cisco Unified Communications Manager — versions 15.0.1.13014-1, 15.0.1.13011-1, 15.0.1.13012-1
- Cisco Unified_communications_manager
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: 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.
Public proof-of-concept exploits
References
- psirt@cisco.com (Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit, Third Party Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2026-20230?
- CVE-2026-20230 is a high-severity vulnerability in Cisco Unified Communications Manager, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2026-06-03.
- How severe is CVE-2026-20230?
- High severity. CVSS v3 base score is 8.6 out of 10.
- Is CVE-2026-20230 known to be exploited?
- Yes. CVE-2026-20230 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-06-25), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.