CVE-2023-20242

A vulnerability in the web-based management interface of Cisco Unified Communications Manager (Unified CM), Cisco Unified CM Session Management Edition (Unified CM SME), and Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P) could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface. This vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

Published: 2023-08-16 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-20242 is rated Low Risk (30.3/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.39%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2023-20242

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 0.15% 0.39% +0.24%
2 2026-05-11 0.12% 0.15% +0.03%
3 2025-11-21 — 0.12% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-20242

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.8 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N 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:H)
They need powerful rights—admin, root, or similar—before this pays off.
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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 1.7 2.7 [email protected]
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N 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:N)
No account or special rights needed—anonymous or random user is enough.
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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]

Weakness enumeration for CVE-2023-20242

Affected software / configurations for CVE-2023-20242

Vendor Product Version Raw CPE
cisco unified_communications_manager 11.5\(1\) cpe:2.3:a:cisco:unified_communications_manager:11.5\(1\):*:*:*:*:*:*:*
cisco unified_communications_manager 11.5\(1\) cpe:2.3:a:cisco:unified_communications_manager:11.5\(1\):*:*:*:session_management:*:*:*
cisco unified_communications_manager 12.5\(1\) cpe:2.3:a:cisco:unified_communications_manager:12.5\(1\):*:*:*:*:*:*:*
cisco unified_communications_manager 12.5\(1\) cpe:2.3:a:cisco:unified_communications_manager:12.5\(1\):*:*:*:session_management:*:*:*
cisco unified_communications_manager 14.0 cpe:2.3:a:cisco:unified_communications_manager:14.0:*:*:*:*:*:*:*
cisco unified_communications_manager 14.0 cpe:2.3:a:cisco:unified_communications_manager:14.0:*:*:*:session_management:*:*:*
cisco unified_communications_manager_im_and_presence_service 11.5\(1\) cpe:2.3:a:cisco:unified_communications_manager_im_and_presence_service:11.5\(1\):*:*:*:*:*:*:*
cisco unified_communications_manager_im_and_presence_service 12.5\(1\) cpe:2.3:a:cisco:unified_communications_manager_im_and_presence_service:12.5\(1\):*:*:*:*:*:*:*
cisco unified_communications_manager_im_and_presence_service 14.0 cpe:2.3:a:cisco:unified_communications_manager_im_and_presence_service:14.0:*:*:*:*:*:*:*

References for CVE-2023-20242

cvelogic Threat Intelligence