CVE-2023-20108
A vulnerability in the XCP Authentication Service of the Cisco Unified Communications Manager IM & Presence Service (Unified CM…
- Published
- Updated
- Reserved
- Assigned by
- cisco
Description
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 improper validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted login message to the affected device. A successful exploit could allow the attacker to cause an unexpected restart of the authentication service, preventing new users from successfully authenticating. Exploitation of this vulnerability does not impact Cisco Unified CM IM&P users who were authenticated prior to an attack.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.93% · top 39% of all CVEs (6 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
Cisco · Cisco Unified Communications Manager IM and Presence Service
- affected 10.5(1)
- affected 10.5(2)
- affected 10.5(2a)
- affected 10.5(2b)
- affected 10.5(2)SU3
- affected 10.5(2)SU2a
- affected 10.5(2)SU4a
- affected 10.5(2)SU4
- affected 10.5(1)SU3
- affected 10.5(1)SU1
- affected 10.5(2)SU1
- affected 10.5(2)SU2
- affected 10.5(1)SU2
- affected 11.5(1)
- affected 11.5(1)SU1
- affected 11.5(1)SU2
- affected 11.5(1)SU3
- affected 11.5(1)SU3a
- affected 11.5(1)SU4
- affected 11.5(1)SU5
- affected 11.5(1)SU5a
- affected 11.5(1)SU6
- affected 11.5(1)SU7
- affected 11.5(1)SU8
- affected 11.5(1)SU9
- affected 11.5(1)SU10
- affected 11.5(1)SU11
- affected 11.0(1)
- affected 11.0(1)SU1
- affected 12.5(1)
- affected 12.5(1)SU1
- affected 12.5(1)SU2
- affected 12.5(1)SU3
- affected 12.5(1)SU4
- affected 12.5(1)SU5
- affected 12.5(1)SU6
- affected 14
- affected 14SU1
- affected 14SU2
- affected 14SU2a
- and 3 more
What to do
Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
References (1)
- cisco-sa-cucm-imp-dos-49GL7rzT (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2023-20108)Record last updated .