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Fencer Intel
medium 6.1

CVE-2025-20351 json

Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Firmware Cross-Site Scripting Vulnerability

published last yr. modified last mo. also EUVD-2025-34666

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

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.

Patch / fix

  • cisco ip_phone_8865_firmware 14.3\(1\)
  • cisco ip_phone_7811_firmware 14.3\(1\)
  • cisco ip_phone_7821_firmware 14.3\(1\)
  • cisco ip_phone_7841_firmware 14.3\(1\)
  • cisco ip_phone_7861_firmware 14.3\(1\)
  • cisco ip_phone_8811_firmware 14.3\(1\)
  • cisco ip_phone_8832_firmware 14.3\(1\)
  • cisco ip_phone_8841_firmware 14.3\(1\)
  • cisco ip_phone_8845_firmware 14.3\(1\)
  • cisco ip_phone_8851_firmware 14.3\(1\)
  • cisco ip_phone_8861_firmware 14.3\(1\)
  • cisco ip_phone_8821_firmware 11.0\(1\)
  • cisco video_phone_8875_firmware 2.3\(1\)

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CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
last yr.

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

  • Cisco Cisco Session Initiation Protocol (SIP) Software

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.