CVE-2025-20351

high-risk
Published 2025-10-15

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.

Do I need to act?

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0.03% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.1/10 Medium
NETWORK / LOW complexity

Affected Products (20)

Desk Phone 9871 Firmware
Desk Phone 9841 Firmware
Desk Phone 9851 Firmware
Desk Phone 9861 Firmware
Ip Phone 7811 Firmware
Ip Phone 7811 Firmware
Ip Phone 7811 Firmware
Ip Phone 7821 Firmware
Ip Phone 7821 Firmware
Ip Phone 7821 Firmware
Ip Phone 7841 Firmware
Ip Phone 7841 Firmware
Ip Phone 7841 Firmware
Ip Phone 7861 Firmware
Ip Phone 7861 Firmware
Ip Phone 7861 Firmware

Affected Vendors

Cisco

References (1)

Vendor Advisory https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/ci...
50
/ 100
high-risk
Severity 23/34 · High
Exploitability 0/34 · Minimal
Exposure 27/34 · High