7.2
HighCVSS 4.0 · from WatchGuard
CVE-2026-93862
Fireware OS Out-of-Bounds Read in FireCluster Sync Allows Denial of Service
Fireware OS · Out-of-bounds read · CWE-125AffectedFireware 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 has to be on the same network. CVSS: adjacent network.
A successful attack can take the service down. CVSS impact.
Description
An out-of-bounds read 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 repeatedly crash the firewall's cluster synchronization process by sending specially crafted network traffic, resulting in a sustained denial of service.
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