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CVE-2026-20230

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

8.6 HIGHActively exploited (CISA KEV)Public exploitEPSS 88.2%
  1. Published3 Jun 2026
  2. Added to CISA KEV25 Jun 2026
  3. Remediation due28 Jun 2026
Actively exploited (CISA KEV)

Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) contain a server-side request forgery (SSRF) Vulnerability that could allow an unauthenticated, remote attacker to write files to the underlying operating system that could be used later to elevate to root.

Added to KEV: 25 Jun 2026Federal remediation due: 28 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Affected products

Cisco Unified Communications Manager≥ 14.0 < 14su6 · ≥ 15.0 ≤ 15su4a

Remediation

Fixed in
Cisco Unified Communications Manager≥ 14su6

References

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Frequently asked

Is CVE-2026-20230 being actively exploited?

Yes. CVE-2026-20230 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 25 Jun 2026.

How severe is CVE-2026-20230?

CVE-2026-20230 has a CVSS 3.1 base score of 8.6, rated high. EPSS estimates a 88.2% probability of exploitation.

Which products are affected by CVE-2026-20230?

Affected products include Cisco Unified Communications Manager.

How do I fix CVE-2026-20230?

Upgrade affected software to a fixed version, for example Cisco Unified Communications Manager 14su6 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-20230 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.