Medium severity · published Oct 27, 2026
CVE-2026-104381
Fireware OS Missing Authentication in FireCluster State Sync Allows BOVPN Tunnel Denial of Service
New
6.0
CVSS
–
EPSS
No
On KEV
Description
A missing authentication vulnerability in Fireware OS's FireCluster state synchronization feature allows an unauthenticated attacker positioned on the cluster synchronization network segment to force premature VPN tunnel termination by sending crafted cluster synchronization traffic.
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FO
Fireware OS · WatchGuard
2025.1 before 2026.4; 12.0 before 12.12.4; 12.0 before 12.5.22 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-104381
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-104381
psirt.watchguard.com
https://psirt.watchguard.com/CVE-2026-104381
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