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HighKEV

CVE-2026-20230 — Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability

CVE-2026-20230 · Cisco Unified Communications Manager · CVSS 8.6 · KEV

In brief

Severity · CVSS
High8.6CVSS 3.1, High
EPSS
88%
CISA KEV
Known exploited, listed since 25 Jun 2026
Vendor
Cisco
Published · Modified
·
Last verified

Summary

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.

Weakness: CWE-918

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

1 branch with a published fixed release · 1 branch without a precise fixed release

Cisco Unified Communications Manager

Source: CVE-2026-20230cisco-sa-cucm-ssrf-cXPnHcW

  1. 15.0
    Affected versionsListed as affected, releases not specified
    First fixed releaseNot published in the sources followed
  2. 15
    Affected versionsListed as affected, releases not specifiedor COP
    First fixed release15SU5 (upcoming)
  3. 14
    Affected versions< 14SU6
    First fixed release14SU6

Remediation

Fix available

Vendor fix

  • Unified Communications Manager 1414SU6

Upgrade to a fixed release listed above for your branch, or to a later fixed release the vendor explicitly supports.

Cisco has released updates that fix this vulnerability; its advisory lists them.

SourceCisco Security Advisory cisco-sa-cucm-ssrf-cXPnHcW

Mitigation (vendor)

Cisco describes a workaround or a mitigation in its advisory.

SourceCisco Security Advisory cisco-sa-cucm-ssrf-cXPnHcW

CISA KEV 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).

Full CISA action

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 due date:

SourceCISA KEV

CERT-FR recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

SourceCERTFR-2026-AVI-0689

Last verified 1 Oct 2026 at 09:32 UTC

Known exploitation

Added to CISA KEV on 25 Jun 2026

Federal remediation due date: 28 Jun 2026

The CISA required action is shown under Remediation.

88% probability of exploitation in the next 30 days (percentile 100%).

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

CERT-FR

1 document of the French national CERT (ANSSI) references this CVE.

Advisory (AVI)CERTFR-2026-AVI-0689Published 4 Jun 2026

Vulnerability in Cisco products

Server-side request forgery (SSRF)

Summary

A vulnerability has been discovered in Cisco products. It allows an attacker to cause server-side request forgery (SSRF).

Recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

Official document on cert.ssi.gouv.frread by Patcharo 28 Sept 2026 at 20:03 UTCMachine translation of the French text published by CERT-FR; a text whose translation did not pass Patcharo's checks stays in French. Identifiers, versions and links are copied unchanged.

Timeline

  1. Published by the source
  2. Added to CISA KEV
  3. CISA remediation due date
  4. Source record last modified
  5. EPSS score computed
  6. Last verified by Patcharo

Official sources

References

Known exploited

Cisco · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS · Cisco Security Advisory cisco-sa-cucm-ssrf-cXPnHcW

How Patcharo reads this

Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.

Read the methodologyRead the guide: Cisco Secure Firewall release trains: Threat Defense, Management Center and ASA versions explained