CVE-2025-20351

MEDIUM

Published Oct 15, 2025 Modified Dec 4, 2025 CWE-79

Description

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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CVSS v3.1 Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
cisco	desk_phone_9871_firmware	3.0\(1\) — 3.2\(1\)
cisco	desk_phone_9871	All
cisco	desk_phone_9841_firmware	3.0\(1\) — 3.2\(1\)
cisco	desk_phone_9841	All
cisco	desk_phone_9851_firmware	3.0\(1\) — 3.2\(1\)
cisco	desk_phone_9851	All
cisco	desk_phone_9861_firmware	3.0\(1\) — 3.2\(1\)
cisco	desk_phone_9861	All
cisco	ip_phone_8865_firmware	< 14.3\(1\)
cisco	ip_phone_8865_firmware	All
cisco	ip_phone_8865_firmware	All
cisco	ip_phone_8865	All
cisco	ip_phone_7811_firmware	< 14.3\(1\)
cisco	ip_phone_7811_firmware	All
cisco	ip_phone_7811_firmware	All
cisco	ip_phone_7811	All
cisco	ip_phone_7821_firmware	< 14.3\(1\)
cisco	ip_phone_7821_firmware	All
cisco	ip_phone_7821_firmware	All
cisco	ip_phone_7821	All
cisco	ip_phone_7841_firmware	< 14.3\(1\)
cisco	ip_phone_7841_firmware	All
cisco	ip_phone_7841_firmware	All
cisco	ip_phone_7841	All
cisco	ip_phone_7861_firmware	< 14.3\(1\)
cisco	ip_phone_7861_firmware	All
cisco	ip_phone_7861_firmware	All
cisco	ip_phone_7861	All
cisco	ip_phone_8811_firmware	< 14.3\(1\)
cisco	ip_phone_8811_firmware	All
cisco	ip_phone_8811_firmware	All
cisco	ip_phone_8811	All
cisco	ip_phone_8832_firmware	< 14.3\(1\)
cisco	ip_phone_8832_firmware	All
cisco	ip_phone_8832_firmware	All
cisco	ip_phone_8832	All
cisco	ip_phone_8841_firmware	< 14.3\(1\)
cisco	ip_phone_8841_firmware	All
cisco	ip_phone_8841_firmware	All
cisco	ip_phone_8841	All
cisco	ip_phone_8845_firmware	< 14.3\(1\)
cisco	ip_phone_8845_firmware	All
cisco	ip_phone_8845_firmware	All
cisco	ip_phone_8845	All
cisco	ip_phone_8851_firmware	< 14.3\(1\)
cisco	ip_phone_8851_firmware	All
cisco	ip_phone_8851_firmware	All
cisco	ip_phone_8851	All
cisco	ip_phone_8861_firmware	< 14.3\(1\)
cisco	ip_phone_8861_firmware	All
cisco	ip_phone_8861_firmware	All
cisco	ip_phone_8861	All
cisco	ip_phone_8821_firmware	< 11.0\(1\)
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821_firmware	All
cisco	ip_phone_8821	All
cisco	video_phone_8875_firmware	< 2.3\(1\)
cisco	video_phone_8875_firmware	3.0\(1\) — 3.2\(1\)
cisco	video_phone_8875_firmware	All
cisco	video_phone_8875_firmware	All
cisco	video_phone_8875	All

References

Advisories & Patches

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-phone-dos-FPyjLV7A

Frequently Asked Questions

What is CVE-2025-20351? +

How severe is CVE-2025-20351? +

CVE-2025-20351 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-20351? +

CVE-2025-20351 affects products from cisco, specifically: desk_phone_9841, desk_phone_9841_firmware, desk_phone_9851, desk_phone_9851_firmware, desk_phone_9861, desk_phone_9861_firmware, desk_phone_9871, desk_phone_9871_firmware, ip_phone_7811, ip_phone_7811_firmware, ip_phone_7821, ip_phone_7821_firmware, ip_phone_7841, ip_phone_7841_firmware, ip_phone_7861, ip_phone_7861_firmware, ip_phone_8811, ip_phone_8811_firmware, ip_phone_8821, ip_phone_8821_firmware, ip_phone_8832, ip_phone_8832_firmware, ip_phone_8841, ip_phone_8841_firmware, ip_phone_8845, ip_phone_8845_firmware, ip_phone_8851, ip_phone_8851_firmware, ip_phone_8861, ip_phone_8861_firmware, ip_phone_8865, ip_phone_8865_firmware, video_phone_8875, video_phone_8875_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-20351? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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