WatchGuard discloses seven critical Fireware OS flaws enabling remote code execution
Supplied data names Fireware OS 2026.4 and 12.12.4 as fixes; this report does not establish exploitation.
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Vulnerability1 · 1 read
CVE-2026-90464
Authenticated arbitrary file overwrite in WatchGuard Fireware OS CLI
- CVSS 4.0
- 7.2 high
- EPSS
- —
- Published
- ·
- Modified
AI analysisSummaries by Vani AI
A diagnostic command in WatchGuard Fireware OS lets a remote attacker who already has at least read-only Device Monitor privileges and management CLI access control file paths. A crafted command creates, truncates, or overwrites arbitrary files and changes kernel parameters as root; written content is limited to numeric values. Firewalls exposing that management CLI are affected.
What to do: Apply WatchGuard's update for CVE-2026-90464. No fixed version or workaround is stated.
| Product | Affected |
|---|---|
| WatchGuard Fireware OS | — |
Estimated exposure
No basis for an estimate.
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
Description · NVD
An external control of file path vulnerability in a WatchGuard Fireware OS firewall diagnostic command allows a remote, authenticated attacker with at least read-only (Device Monitor) privileges and access to the management CLI to create, truncate, or overwrite arbitrary files and modify kernel parameters with root privileges by submitting a specially crafted command. Written content is limited to numeric values.
- Weakness
- CWE-59, CWE-73, CWE-732
- Vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/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