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9.4

WatchGuard Fireware OS lets network attacker gain admin control

CVE-2026-90465 · published 5 days ago
Summary

If an attacker can reach the network that connects clustered Fireware firewalls, they can send a crafted message that gives them full administrative rights on the devices. This could let them change settings, view traffic, or disable protection. Apply the latest updates from WatchGuard and keep the cluster communication network isolated and protected.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
watchguard fireware os < 2026.4
< 12.5.22
Original advisory text
Fireware OS Missing Authentication in FireCluster Sync Allows Privilege Escalation
A missing authentication vulnerability in the FireCluster Sync processing allows an attacker positioned on the cluster interconnect, such as a compromised cluster peer or an on-path network attacker, to invoke privileged firewall management actions as root by sending a specially crafted request.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.4 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-77Command Injection
CWE-290Authentication Bypass by Spoofing
CWE-306Missing Authentication for Critical Function
CWE-862Missing Authorization
Timeline
Published27 Oct 2026
Updated29 Oct 2026
First seen27 Oct 2026
Sources
CVE-2026-90465 · NVD
CVE-2026-90465 · MITRE
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