CVE-2026-19313#

Fireware OS Pre-Authentication Heap Buffer Overflow in iked Allows Remote Code Execution

Critical 9.3 CVSS v4.0 › Published 2026-08-27Updated 2026-08-27

Summary #

An heap overflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to execute arbitrary code by sending specially crafted network traffic.

Impact: An unauthenticated remote attacker can trigger a heap buffer overflow in the IKE daemon, causing a crash and denial of service, with the potential for remote code execution due to attacker-controlled data being written beyond the bounds of the allocated buffer.

Product status #

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

Weakness Type and Impact #

CWECWE-122Heap-based Buffer Overflow
CWECWE-190Integer Overflow or Wraparound
CWECWE-680Integer Overflow to Buffer Overflow
CAPECCAPEC-92Forced Integer Overflow
CAPECCAPEC-100Overflow Buffers

Exploitation Status #

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

Solution #

Fireware OS 2026.2.2, Fireware OS 12.12.2, Fireware OS 12.5.20

References #

Credits #

McCaulay Hudson (@_McCaulay) of watchTowrfinder