WatchGuard TechnologiesCVE-2026-86134
WatchGuard Technologies Fireware OS: null pointer dereference
High8.7CVE-2026-86134 · Published Sep 30, 2026
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Fireware OS Product | >= 2026.3, < 2026.3.2 | 2026.3.2 |
| >= 2025.0, < 2026.2.3 | 2026.2.3 | |
| >= 12.0, < 12.12.3 | 12.12.3 | |
| >= 12.0, < 12.5.21 | 12.5.21 |
Details and references
- CVSS 4.0
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-476
More WatchGuard Technologies advisories
All WatchGuard Technologies| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Sep 30 | WatchGuard Technologies Fireware OS: integer overflow | High8.2 | 2026.3.2+3 more |
| Sep 30 | WatchGuard Technologies Fireware OS: missing authorization | High7.1 | 2026.3.2+3 more |
| Sep 30 | WatchGuard Technologies Fireware OS: missing authorization | High7.1 | 2026.3.2+3 more |
| Sep 30 | WatchGuard Technologies Fireware OS: stack buffer overflow | High8.6 | 2026.3.2+3 more |
| Sep 30 | WatchGuard Technologies Fireware OS: stack buffer overflow | High8.7 | 2026.3.2+2 more |
| Sep 30 | WatchGuard Technologies Fireware OS: improper authorization | High7.2 | 2026.3.2+3 more |