Medium severity · published Jun 28, 2023
CVE-2023-20116
A vulnerability in the Administrative XML Web Service (AXL) API of Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management…
5.7
CVSS
0.7%
EPSS
No
On KEV
Description
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 web UI of the Self Care Portal. An attacker could exploit this vulnerability by sending crafted HTTP input to an affected device. A successful exploit could allow the attacker to cause a DoS condition on the affected device.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CU
Cisco Unified Communications Manager · Cisco
12.0(1)SU1; 12.0(1)SU2; 12.0(1)SU3; 12.0(1)SU4; 12.0(1)SU5; 12.5(1); +11 more · source: vendor
CU
Cisco Unified Communications Manager / Cisco Unity Connection · Cisco
10.5(2)SU10; 10.5(1); 10.5(1)SU1; 10.5(1)SU1a; 10.5(2); 10.5(2)SU1; +34 more · source: vendor
UC
Unified Communications Manager · Cisco
11.5(1.10000.6); 11.5(1.10000.6); 12.0(1.10000.10); 12.0(1.10000.10); 12.5(1.10000.22); 12.5(1.10000.22); +2 more · source: NVD
Affected product
CU
Cisco Unified Communications Manager
Cisco
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-20116
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-20116
Vendor Advisory
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-dos-4Ag3yWbD
More from Cisco Unified Communications Manager
9.8
CVE-2026-20045
Cisco Unified Communications Products Remote Code Execution Vulnerability
8.6
CVE-2026-20230
Cisco Unified Communications Manager Server-Side Request Forgery Vulnerability
10.0
CVE-2025-20309
Cisco Unified Communications Manager Static SSH Credentials Vulnerability
10.0
CVE-2024-20253
A vulnerability in multiple Cisco Unified Communications and Contact Center Solutions products could allow an unauthenticated, remote attacker to execute arbitrary code on an…
9.8
CVE-2026-76474
Cisco Unified Communications Products Hardening Release: October 2026 - Improper Authentication Vulnerabilities