CVE-2026-86134Fireware OS Pre-Authentication NULL Pointer Dereference Allows Remote Denial of Service
Updated under an hour ago ()
Does this affect you?
It affects WatchGuard Fireware OS and 1 other product. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.38%, higher than 30% of scored CVEs.
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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
- 8.7 HIGH (v4.0, CNA)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
- Weakness (CWE)
- CWE-476
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.38% (percentile 30)
- Assigned by
- WatchGuard
- NVD analysis
- Analyzed
- Record last updated
- Sep 30, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
WatchGuard Fireware OS watchguard:fireware_os (from the name) | from 2026.3 before 2026.3.2; from 2025.0 before 2026.2.3; from 12.0 before 12.12.3 | CNA record |
watchguard fireware watchguard:fireware | from 12.0 before 12.5.21; from 12.12 before 12.12.3; from 2025.0 before 2026.2.3; from 2026.3 before 2026.3.2 | NVD |
References
- https://psirt.watchguard.com/CVE-2026-86134vendor-advisory, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.