CVE-2026-86131
WatchGuard Fireware OS
- WatchGuard Fireware OS
- Critical
- CVSS 9.2
- EPSS 0.47%
- Fixed version listed
What to do
Fixed version listed
Affected products
| Product | Affected | Fixed in |
|---|---|---|
| WatchGuard Fireware OS (Default) | from 2026.3, before 2026.3.2; from 2025.0, before 2026.2.3; from 12.0, before 12.12.3 | 2026.3.2, 2026.2.3, 12.12.3 |
| WatchGuard Fireware OS (T15/T35) | from 12.0, before 12.5.21 | None listed |
Advisories and fixes
- Vendor advisory psirt.watchguard.com
Scores and signals
- Exploitation
- No known exploitation
- Severity
- Critical, CVSS 9.2 (v4.0, scored by WatchGuard)
- EPSS
- 0.47% chance of exploitation in the next 30 days (EPSS from FIRST, as of Oct 26, 2026)
- CISA's SSVC decision points
- Exploitation: none. Automatable: yes. Technical impact: total. As of Oct 1, 2026.
- Weakness
- CWE-295: CWE-295; CWE-829: CWE-829; CWE-94: CWE-94
- Vendor
- WatchGuard, Fireware OS
Timeline
- First listed as critical by cve.now. Affected and fixed versions come from the CVE record, once one is published.