CVE-2023-20116 — A vulnerability in the Administrative XML Web Service (AXL) API of Cisco Unified

A vulnerability in the Administrative XML Web Service (AXL) API of Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an authenticated, remote attacker to cause a denial of service (Do

01What is this vulnerability?

A vulnerability in the Administrative XML Web Service (AXL) API of Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient validation of user-supplied input to the…

02Affected products

Vendor	Product	Versions
Cisco	Cisco Unified Communications Manager	12.0(1)SU1, 12.0(1)SU2, 12.0(1)SU3, 12.0(1)SU4, 12.0(1)SU5, 12.5(1), 12.5(1)SU1, 12.5(1)SU2, 12.5(1)SU3, 12.5(1)SU4, 12.5(1)SU5, 12.5(1)SU6, 12.5(1)SU7, 12.5(1)SU7a, 14, 14SU1, 14SU2
Cisco	Cisco Unified Communications Manager / Cisco Unity Connection	10.5(2)SU10, 10.5(1), 10.5(1)SU1, 10.5(1)SU1a, 10.5(2), 10.5(2)SU1, 10.5(2)SU2, 10.5(2)SU3, 10.5(2)SU4, 10.5(2)SU5, 10.5(2)SU6, 10.5(2)SU7, 10.5(2)SU8, 10.5(2)SU9, 10.5(2)SU2a, 10.5(2)SU3a, 10.5(2)SU4a, 10.5(2)SU6a, 11.0(1), 11.0(1a), 11.0(1a)SU1, 11.0(1a)SU2, 11.0(1a)SU3, 11.0(1a)SU3a, 11.0(1a)SU4, 11.0.1, 11.0.2, 11.0.5, 11.5(1), 11.5(1)SU1, 11.5(1)SU2, 11.5(1)SU3, 11.5(1)SU3a, 11.5(1)SU3b, 11.5(1)SU4, 11.5(1)SU5, 11.5(1)SU6, 11.5(1)SU7, 11.5(1)SU8, 11.5(1)SU9, 11.5(1)SU10, 11.5(1)SU11, 10.0(1)SU2, 10.0(1), 10.0(1)SU1

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-06-28T00:00:00.000Z
• Last modified: 2024-08-02T08:57:35.868Z

09References

• sec.cloudapps.cisco.com — https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/ci…