CVE-2026-20230

Awaiting Analysis

Published: 03 Jun 2026, 16:09

Last modified:26 Jun 2026, 03:55

Vulnerability Summary

Overall Risk (default)

high

51/100

CVSS Score

8.6 HIGH

v3.1 (cve.org)

EPSS Score

34.16% HIGH

34% probability +8.30%

KEV

Listed

CISA

1 listing

Ransomware

No reports

Public exploits

1 found

Dark Web

Not detected

Timeline

03 Jun 2026, 16:09

Published

Vulnerability first disclosed

25 Jun 2026, 00:00

Added to CISA KEV

Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) Vulnerability

26 Jun 2026, 03:55

Last Modified

Vulnerability information updated

28 Jun 2026, 00:00

CISA Remediation Due

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.

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.

CVSS Metrics

v3.1•HIGH•Score: 8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

EPSS Trends

Current EPSS score: 34.16%• Percentile: 98%

Techniques & Countermeasures

CWE-918•Server-Side Request Forgery (SSRF)
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Affected Systems

cisco•cisco unified communications manager
N/A