CVE-2026-86134

EUVD-2026-89605
A NULL pointer dereference vulnerability in the WatchGuard Fireware OS authentication process allows a remote, unauthenticated attacker to crash the management daemon by sending a specially request to the login interface, resulting in a denial of service.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 34.81%
Affected Products (NVD)
VendorProductVersion
watchguardfireware
12.0 ≤
𝑥
< 12.5.21
watchguardfireware
12.12 ≤
𝑥
< 12.12.3
watchguardfireware
2025.0 ≤
𝑥
< 2026.2.3
watchguardfireware
2026.3 ≤
𝑥
< 2026.3.2
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://psirt.watchguard.com/CVE-2026-86134