CVE-2026-86134
highA NULL pointer dereference vulnerability in the WatchGuard Fireware OS authentication process allows a remote, unauthenticated attacker to crash the management…
Vendor / product: Watchguard — fireware
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.
CVSS
7.5
7.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-09-30 04:18
Modified: 2026-10-06 17:30
NVD status: Analyzed
Last synced 2 days ago
Verified against the source API 2026-10-27 06:56 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
watchguard / fireware ≥12.0 <12.5.21, ≥12.12 <12.12.3, ≥2025.0 <2026.2.3, ≥2026.3 <2026.3.2
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://psirt.watchguard.com/CVE-2026-86134
Patch / mitigation: https://psirt.watchguard.com/CVE-2026-86134
References
- https://psirt.watchguard.com/CVE-2026-86134 5d1c2695-1a31-4499-88ae-e847036fd7e3
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:56 UTC · record ↗