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.

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: 0.000 (9.9th 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)

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

cisco-sa-phone-dos-FPyjLV7A

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.