HackZoneLabs News
Newsletter

CVE-2026-20230

Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability

  • High 8.6
  • Exploited: added to CISA KEV 25 Jun 2026

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.

Key facts

Published
3 Jun 2026
Last changed
7 Oct 2026
Assigned by
cisco
KEV added
25 Jun 2026
KEV fix due
28 Jun 2026
EPSS
88.528% likely to be exploited in the next 30 days, higher than 99.776% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: no; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 8.6CVSS 3.1, Highfrom the CNA (cisco)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

What to do

  • 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 KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
CiscoCisco Unified Communications Manager
  • Default status: unknown
  • 14 (affected)
  • 14SU1 (affected)
  • 14SU2 (affected)
  • 14SU3 (affected)
  • 15 (affected)
  • 15SU1 (affected)
  • 14SU4 (affected)
  • 14SU4a (affected)
  • 15SU1a (affected)
  • 15SU2 (affected)
  • 15.0.1.13010-1 (affected)
  • 15.0.1.13011-1 (affected)
  • 15.0.1.13012-1 (affected)
  • 15.0.1.13013-1 (affected)
  • 15.0.1.13014-1 (affected)
  • 15.0.1.13015-1 (affected)
  • 15.0.1.13016-1 (affected)
  • 15.0.1.13017-1 (affected)
  • 15SU3a (affected)
  • 14SU5 (affected)
  • 15SU4 (affected)
  • 15SU4a (affected)

Timeline

  1. 3 Jun 2026 Published
  2. 25 Jun 2026 Added to the CISA KEV catalogue

Weakness

Practice this bug class

HackZoneLabs has a hands-on lab on SSRF (CWE-918).

Open the learning platform

References