CVE-2026-78010#

Fireware OS Stack-Based Buffer Overflow in iked Allows Unauthenticated Denial of Service

High 8.7 CVSS v4.0 › Published 2026-08-27Updated 2026-09-03

Summary #

A stack-based buffer overflow vulnerability in the WatchGuard Fireware OS iked process iallows a remote unauthenticated attacker to create a Denial of Service (DoS) condition in VPN processing by sending specially crafted network traffic.

Product status #

Product	Affected	Not affected
Fireware OS
Default	>= 2026.3, < 2026.3.1, >= 2025.0, < 2026.2.2, >= 12.0, < 12.12.2	>= 2026.3.1, >= 2026.2.2, >= 12.12.2
T15/T35	>= 12.0, < 12.5.20	>= 12.5.20

Weakness Type and Impact #

CWECWE-121Stack-based Buffer Overflow
CWECWE-787Out-of-bounds Write
CWECWE-1284Improper Validation of Specified Quantity in Input
CAPECCAPEC-46Overflow Variables and Tags
CAPECCAPEC-47Buffer Overflow via Parameter Expansion
CAPECCAPEC-100Overflow Buffers

Exploitation Status #

WatchGuard is not aware of any exploitation of this vulnerability in the wild.

Solution #

Fireware OS 2026.3.1, Fireware OS 2026.2.2, Fireware OS 12.12.2, Fireware OS 12.5.20

References #

Credits #

Discovered Internally by WatchGuard AI Security Researchfinder