7.2
HighCVSS 4.0 · from WatchGuard
CVE-2026-90464
Fireware OS Missing Command Validation allows Authenticated Arbitrary File Modification as Root
Fireware OS · Link following · CWE-59AffectedFireware OS, Fireware OS
FixUpdate to 2026.4, 12.12.4, 12.5.22 or newer
PublishedOct 27, 15:52 · WatchGuard
ScoredOct 27 · 7.2 · WatchGuard
Exploit code publicNone known · checked 21:18 UTC
ExploitedNone known · CISA KEV checked 22:07 UTC
What we know
No known exploitation. CISA KEV, checked 22:07 UTC.
No public exploit code known. Exploit-DB, Metasploit, Nuclei, checked 21:18 UTC.
An attacker needs network access and an account. CVSS: network, low privileges.
A successful attack can change data and take the service down. CVSS impact.
Description
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.
From WatchGuard
Affected and fixed versions
ProductAffectedFixed inFireware OS2025.1 – before 2026.42026.4Fireware OS12.0 – before 12.12.412.12.4Fireware OS12.0 – before 12.5.2212.5.22
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known