CVE-2025-6999

6.9 mediumEPSS 0.4%

Medium (6.9). EPSS 0.4% chance of exploitation in the next 30 days.

An HTTP Request Smuggling [CWE-444] vulnerability in the Authentication portal of WatchGuard Fireware OS allows a remote attacker to evade request parameter sanitation and perform a reflected self-Cross-Site Scripting (XSS) attack. WatchGuard does not believe there is a practical exploit chain with a meaningful security impact for this vulnerability.

Severity

CVSS 4.0

6.9 medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 39% of CVEs (scores of 2026-10-31)
CWE: CWE-444
Published: 2025-09-15
Modified: 2026-08-10
Record from: the NVD, synced 2026-10-19

References

https://psirt.watchguard.com/CVE-2025-6999
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00014

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