CVE-2025-20351 | Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Firmware 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 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.

Published: 2025-10-15 Last update: 2025-12-04 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-20351 is rated Low Risk (27/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.03%). 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-2025-20351

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 2026-03-13 0.05% 0.03% -0.03%
2 2025-12-22 0.04% 0.05% +0.01%
3 2025-10-16 — 0.04% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-20351

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
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-2025-20351

Affected software / configurations for CVE-2025-20351

Vendor Product Version Raw CPE
cisco desk_phone_9871_firmware >= 3.0\(1\), <= 3.2\(1\) cpe:2.3:o:cisco:desk_phone_9871_firmware:*:*:*:*:*:*:*:*
cisco desk_phone_9841_firmware >= 3.0\(1\), <= 3.2\(1\) cpe:2.3:o:cisco:desk_phone_9841_firmware:*:*:*:*:*:*:*:*
cisco desk_phone_9851_firmware >= 3.0\(1\), <= 3.2\(1\) cpe:2.3:o:cisco:desk_phone_9851_firmware:*:*:*:*:*:*:*:*
cisco desk_phone_9861_firmware >= 3.0\(1\), <= 3.2\(1\) cpe:2.3:o:cisco:desk_phone_9861_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8865_firmware < 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8865_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8865_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8865_firmware:14.3\(1\):*:*:*:*:*:*:*
cisco ip_phone_8865_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8865_firmware:14.3\(1\):sr1:*:*:*:*:*:*
cisco ip_phone_7811_firmware < 14.3\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:14.3\(1\):*:*:*:*:*:*:*
cisco ip_phone_7811_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_7811_firmware:14.3\(1\):sr1:*:*:*:*:*:*
cisco ip_phone_7821_firmware < 14.3\(1\) cpe:2.3:o:cisco:ip_phone_7821_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_7821_firmware:14.3\(1\):*:*:*:*:*:*:*
cisco ip_phone_7821_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_7821_firmware:14.3\(1\):sr1:*:*:*:*:*:*
cisco ip_phone_7841_firmware < 14.3\(1\) cpe:2.3:o:cisco:ip_phone_7841_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_7841_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_7841_firmware:14.3\(1\):*:*:*:*:*:*:*
cisco ip_phone_7841_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_7841_firmware:14.3\(1\):sr1:*:*:*:*:*:*
cisco ip_phone_7861_firmware < 14.3\(1\) cpe:2.3:o:cisco:ip_phone_7861_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_7861_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_7861_firmware:14.3\(1\):*:*:*:*:*:*:*
cisco ip_phone_7861_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_7861_firmware:14.3\(1\):sr1:*:*:*:*:*:*
cisco ip_phone_8811_firmware < 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8811_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8811_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8811_firmware:14.3\(1\):*:*:*:*:*:*:*
cisco ip_phone_8811_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8811_firmware:14.3\(1\):sr1:*:*:*:*:*:*
cisco ip_phone_8832_firmware < 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8832_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8832_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8832_firmware:14.3\(1\):*:*:*:*:*:*:*
cisco ip_phone_8832_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8832_firmware:14.3\(1\):sr1:*:*:*:*:*:*
cisco ip_phone_8841_firmware < 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8841_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8841_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8841_firmware:14.3\(1\):*:*:*:*:*:*:*
cisco ip_phone_8841_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8841_firmware:14.3\(1\):sr1:*:*:*:*:*:*
cisco ip_phone_8845_firmware < 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8845_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8845_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8845_firmware:14.3\(1\):*:*:*:*:*:*:*
cisco ip_phone_8845_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8845_firmware:14.3\(1\):sr1:*:*:*:*:*:*
cisco ip_phone_8851_firmware < 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8851_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8851_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8851_firmware:14.3\(1\):*:*:*:*:*:*:*
cisco ip_phone_8851_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8851_firmware:14.3\(1\):sr1:*:*:*:*:*:*
cisco ip_phone_8861_firmware < 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8861_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8861_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8861_firmware:14.3\(1\):*:*:*:*:*:*:*
cisco ip_phone_8861_firmware 14.3\(1\) cpe:2.3:o:cisco:ip_phone_8861_firmware:14.3\(1\):sr1:*:*:*:*:*:*
cisco ip_phone_8821_firmware < 11.0\(1\) cpe:2.3:o:cisco:ip_phone_8821_firmware:*:*:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(0.7\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(0.7\):mpp:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(1\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(1\):*:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(2\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(2\):*:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(2\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(2\):sr1:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(2\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(2\):sr2:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(3\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(3\):*:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(3\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(3\):sr1:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(3\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(3\):sr2:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(3\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(3\):sr3:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(3\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(3\):sr4:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(3\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(3\):sr5:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(3\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(3\):sr6:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(4\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(4\):*:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(4\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(4\):sr1:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(4\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(4\):sr2:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(4\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(4\):sr3:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(5\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(5\):*:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(5\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(5\):sr1:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(5\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(5\):sr2:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(5\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(5\):sr3:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(6\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(6\):*:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(6\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(6\):sr1:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(6\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(6\):sr2:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(6\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(6\):sr4:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(6\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(6\):sr5:*:*:*:*:*:*
cisco ip_phone_8821_firmware 11.0\(6\) cpe:2.3:o:cisco:ip_phone_8821_firmware:11.0\(6\):sr6:*:*:*:*:*:*
cisco video_phone_8875_firmware < 2.3\(1\) cpe:2.3:o:cisco:video_phone_8875_firmware:*:*:*:*:*:*:*:*
cisco video_phone_8875_firmware >= 3.0\(1\), <= 3.2\(1\) cpe:2.3:o:cisco:video_phone_8875_firmware:*:*:*:*:*:*:*:*
cisco video_phone_8875_firmware 2.3\(1\) cpe:2.3:o:cisco:video_phone_8875_firmware:2.3\(1\):*:*:*:*:*:*:*
cisco video_phone_8875_firmware 2.3\(1\) cpe:2.3:o:cisco:video_phone_8875_firmware:2.3\(1\):sr1:*:*:*:*:*:*

References for CVE-2025-20351

cvelogic Threat Intelligence