Stored cross-site scripting in Cisco Systems, Inc products - CVE-2025-20342

Vulnerability identifier: #VU114565

CSH Severity: Low

CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]

CVE-ID: CVE-2025-20342

CWE-ID: CWE-79

Exploitation vector: Remote access

Exploit availability: No public exploit available

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in the Virtual Keyboard Video Monitor (vKVM) connection handling. A remote user can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Catalyst 8300 Series Edge Universal CPE
Cisco Intersight Server
UCS E-Series Servers M6
UCS C-Series M8 Rack Servers
UCS C-Series M7 Rack Servers
UCS C-Series M6 Rack Servers
Enterprise NFV Infrastructure Software
UCS X-Series Modular System
UCS B-Series Blade Servers
Cisco Integrated Management Controller
Cisco UCS Manager

Install updates from vendor's website.

Cisco Intersight Server - addressed in versions 4.2(3l), 5.0(4i), 5.3(0.250001)
Enterprise NFV Infrastructure Software - update to 4.18.1
UCS X-Series Modular System - addressed in versions 4.2(3o), 4.3(5c)
UCS E-Series Servers M6 - update to 4.15.2
UCS C-Series M8 Rack Servers - addressed in versions 4.2(3o), 4.3(5c), 4.3(5.250001)
UCS C-Series M7 Rack Servers - addressed in versions 4.2(3o), 4.3(5c), 4.3(5.250001)
UCS C-Series M6 Rack Servers - addressed in versions 4.2(3o), 4.3(5c), 4.3(5.250001)
Cisco UCS Manager - addressed in versions 4.2(3p), 4.3(6a)
UCS B-Series Blade Servers - addressed in versions 4.2(3o), 4.3(5c)

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucs-kvmsxss-6h7AnUyk

• Stored cross-site scripting in Cisco Integrated Management Controller