CVE-2026-20230
Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability
Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
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.
CISA notes
https://www.cisco.com/c/en/us/support/docs/csa/cisco-sa-cucm-ssrf-cXPnHcW.html ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-20230
Description
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.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:NExploitation Context
as of October 14, 2026- CISA added CVE-2026-20230 to the KEV catalog 22 days after its CVE record was published. The median for entries added in 2026 so far is 15 days.
- It is one of 100 Cisco entries in the CISA KEV catalog, and one of 18 added in 2026.
- Its current EPSS score (88.2%) is higher than that of 71% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Cisco | Cisco Cisco Unified Communications Manager | 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 15SU4 15SU4a |
References
1 LinksRecord Details
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