Out-of-Bounds Read Vulnerability in FireCluster Sync Processing by WatchGuard
CVE-2026-93862

7.2HIGH

Key Information:

Vendor

Watchguard

Status
Fireware Os
Vendor
CVE Published:
27 October 2026

Badges

đź‘ľ Exploit Exists

What is CVE-2026-93862?

An out-of-bounds read vulnerability exists in the FireCluster Sync processing of WatchGuard devices. When exploited, this flaw allows an attacker positioned on the cluster interconnect—either through a compromised cluster peer or as an on-path network attacker—to send specially crafted network traffic. This can lead to a continual crashing of the firewall's cluster synchronization process, resulting in prolonged denial of service and network instability.

Affected Version(s)

Fireware OS Default 2025.1 < 2026.4

Fireware OS Default 12.0 < 12.12.4

Fireware OS T15/T35 12.0 < 12.5.22

References

https://psirt.watchguard.com/CVE-2026-93862
vendor-advisory

CVSS V4

Score:
7.2
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • đź‘ľ

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

WatchGuard AI Security Research
.