XSS in Cisco Session Initiation Protocol (Sip) Software
CVE-2025-20351
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…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.003 (18.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Cisco Session Initiation Protocol (Sip) Software — versions 12.1(1)SR1, 11.5(1), 10.3(2)
- Cisco Desk_phone_9841
- Cisco Desk_phone_9841_firmware
- Cisco Desk_phone_9851
- Cisco Desk_phone_9851_firmware
- Cisco Desk_phone_9861
- Cisco Desk_phone_9861_firmware
- Cisco Desk_phone_9871
- Cisco Desk_phone_9871_firmware
- Cisco Ip_phone_7811
Weakness classification (CWE)
Public proof-of-concept exploits
References
- psirt@cisco.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-20351?
- CVE-2025-20351 is a medium-severity vulnerability in Cisco Session Initiation Protocol (Sip) Software, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-10-15.
- How severe is CVE-2025-20351?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2025-20351 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.