Out-of-bounds Read in Watchguard Fireware OS

CVE-2026-93862

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.

Vulnerability class: Buffer Overflow

Published 2026-10-27.