CVE-2023-20108 — A vulnerability in the XCP Authentication Service of the Cisco Unified Communica

A vulnerability in the XCP Authentication Service of the Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P) could allow an unauthenticated, remote attacker to cause a temporary service outage for all Cisco Unified CM IM&P users wh

01What is this vulnerability?

A vulnerability in the XCP Authentication Service of the Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P) could allow an unauthenticated, remote attacker to cause a temporary service outage for all Cisco Unified CM IM&P users who are attempting to authenticate to the service, resulting in a denial of service (DoS) condition. This vulnerability is due to…

02Affected products

Vendor	Product	Versions
Cisco	Cisco Unified Communications Manager IM and Presence Service	10.5(1), 10.5(2), 10.5(2a), 10.5(2b), 10.5(2)SU3, 10.5(2)SU2a, 10.5(2)SU4a, 10.5(2)SU4, 10.5(1)SU3, 10.5(1)SU1, 10.5(2)SU1, 10.5(2)SU2, 10.5(1)SU2, 11.5(1), 11.5(1)SU1, 11.5(1)SU2, 11.5(1)SU3, 11.5(1)SU3a, 11.5(1)SU4, 11.5(1)SU5, 11.5(1)SU5a, 11.5(1)SU6, 11.5(1)SU7, 11.5(1)SU8, 11.5(1)SU9, 11.5(1)SU10, 11.5(1)SU11, 11.0(1), 11.0(1)SU1, 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, 14, 14SU1, 14SU2, 14SU2a, 10.0(1), 10.0(1)SU1, 10.0(1)SU2

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: 2024-08-02T08:57:35.889Z

09References

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