XSS in Watchguard Fireware OS

CVE-2025-6947

A stored cross-site scripting (XSS) vulnerability exists in the management interface of WatchGuard Firebox appliances via the SIP Proxy configuration. An authenticated remote attacker with administrator privileges could exploit this vulnerability to execute arbitrary JavaScript code in the Firebox management interface of another management user.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

EPSS exploit prediction

EPSS: 0.005 (38.6th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-6947: held from 0.005 to 0.005.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-6947?
CVE-2025-6947 is a vulnerability in Watchguard Fireware OS, classified under Cross-site Scripting. Published 2025-09-15.
Is CVE-2025-6947 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.