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 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.

Published: 2023-06-28 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-20116 is rated Moderate Risk (42.7/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.60%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-20116

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.47% 0.60% +0.13%
2 2026-03-23 0.38% 0.47% +0.09%
3 2026-02-20 — 0.38% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-20116

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.8 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.3 4.0 [email protected]
5.7 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.1 3.6 [email protected]

Weakness enumeration for CVE-2023-20116

Affected software / configurations for CVE-2023-20116

Vendor Product Version Raw CPE
cisco unified_communications_manager 11.5\(1.10000.6\) cpe:2.3:a:cisco:unified_communications_manager:11.5\(1.10000.6\):*:*:*:*:*:*:*
cisco unified_communications_manager 11.5\(1.10000.6\) cpe:2.3:a:cisco:unified_communications_manager:11.5\(1.10000.6\):*:*:*:session_management:*:*:*
cisco unified_communications_manager 12.0\(1.10000.10\) cpe:2.3:a:cisco:unified_communications_manager:12.0\(1.10000.10\):*:*:*:*:*:*:*
cisco unified_communications_manager 12.0\(1.10000.10\) cpe:2.3:a:cisco:unified_communications_manager:12.0\(1.10000.10\):*:*:*:session_management:*:*:*
cisco unified_communications_manager 12.5\(1.10000.22\) cpe:2.3:a:cisco:unified_communications_manager:12.5\(1.10000.22\):*:*:*:*:*:*:*
cisco unified_communications_manager 12.5\(1.10000.22\) cpe:2.3:a:cisco:unified_communications_manager:12.5\(1.10000.22\):*:*:*:session_management:*:*:*
cisco unified_communications_manager 14.0\(1.10000.20\) cpe:2.3:a:cisco:unified_communications_manager:14.0\(1.10000.20\):*:*:*:*:*:*:*
cisco unified_communications_manager 14.0\(1.10000.20\) cpe:2.3:a:cisco:unified_communications_manager:14.0\(1.10000.20\):*:*:*:session_management:*:*:*

References for CVE-2023-20116

cvelogic Threat Intelligence