A vulnerability in the web UI of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 running Cisco SIP Software could allow an unauthenticated, remote attacker to conduct XSS attacks against a user of the web UI. This vulnerability exists because the web UI of an affected device does not sufficiently validate user-supplied input. An attacker could exploit this vulnerability by persuading a user 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. Note: To exploit this vulnerability, the phone must be registered to Cisco Unified Communications Manager and have Web Access enabled. Web Access is disabled by default.

A vulnerability in the web UI of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 running Cisco SIP Software could allow an unauthenticated, remote attacker to conduct XSS attacks against a user of the web UI. This vulnerability exists because the web UI of an affected device does not sufficiently validate user-supplied input. An attacker could exploit this vulnerability by persuading a user 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. Note: To exploit this vulnerability, the phone must be registered to Cisco Unified Communications Manager and have Web Access enabled. Web Access is disabled by default.

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According to its self-reported version, the remote Cisco Desk, IP, or Video Phone running SIP Software is affected by a cross site scripting vulnerability:

  - A vulnerability in the web UI of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video     Phone 8875 running Cisco SIP Software could allow an unauthenticated, remote attacker to conduct XSS attacks against     a user of the web UI. This vulnerability exists because the web UI of an affected device does not sufficiently     validate user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a crafted     link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected     nterface or access sensitive, browser-based information. Note: To exploit this vulnerability, the phone must be     registered to Cisco Unified Communications Manager and have Web Access enabled. Web Access is disabled by default.
    (CVE-2025-20351)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

ID	Name	Product	Family	Severity
504993	Cisco IP Phones Improper Neutralization of Input During Web Page Generation (CVE-2025-20351)	Tenable OT Security	Tenable.ot	medium
271390	Cisco Desk/IP/Video Phone Cross Site Scripting (cisco-sa-phone-dos-FPyjLV7A) (CVE-2025-20351)	Nessus	CISCO	medium

Detections

Analytics

CVE-2025-20351

medium

Tenable Plugins

medium

medium