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CVE-2026-20230

HighExploitedPublic exploit

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…

Published Jun 3, 2026 · Updated Oct 7, 2026 · Also known as EUVD-2026-34137, GHSA-fcv7-pchj-75c2

Key Facts

Patch immediately
  • CVE-2026-20230 is a high-severity vulnerability (CVSS 8.6 v3.1) affecting Unified Communications Manager (Cisco).
  • It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 22, 2026. Public exploit code is available.
  • EPSS estimates a 88% probability of exploitation in the next 30 days.
  • Fixed versions are available, including Unified Communications Manager 14su6.
  • Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

8.6

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

EPSS (30-day exploit likelihood)

88%

Higher than 99.7% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2026-20230 brief as a PDF

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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.

Known-Exploited Catalog Listings

CatalogAddedRemediation dueRansomware use
CISA KEVJun 25, 2026Jun 28, 2026Not reported
Industry KEV feedJun 22, 2026Jun 28, 2026Not reported
CIRCL KEVJun 23, 2026Jun 28, 2026Not reported
ENISA EUVDJun 25, 2026n/aNot reported

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.

Affected Products

4 affected entries in total
ProductAffected versionsFixed in
Unified Communications ManagerCisco>= N/A14su6

Patched Releases

Unified Communications Manager

14su6

Timeline

  1. Publicly disclosed

    Jun 3, 2026

  2. Added to Industry KEV feed

    Jun 22, 2026

  3. Added to CIRCL KEV

    Jun 23, 2026

  4. Added to CISA KEV

    Jun 25, 2026

  5. Added to ENISA EUVD

    Jun 25, 2026

  6. Last updated

    Oct 7, 2026

Weakness Type

  • CWE-918 Server-Side Request Forgery (SSRF)

References

3 more references in the full CVE brief

FAQ

Common Questions.

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