CVE-2026-19318 PUBLISHED

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

Assigner: WatchGuard
Reserved: 07.08.2026 Published: 27.08.2026 Updated: 27.08.2026

A stack-based buffer overflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to execute arbitrary code by sending specially crafted network traffic.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	WatchGuard
Product	Fireware OS
Versions	Default: unaffected affected from 2025.0 to 2026.2.2 (excl.) affected from 12.0 to 12.12.2 (excl.)

Vendor	WatchGuard
Product	Fireware OS
Versions	Default: unaffected affected from 12.0 to 12.5.20 (excl.)

Affected Configurations

This vulnerability is exploitable on systems where the Mobile VPN with IKEv2 or a Branch Office VPN with IKEv2 is configured.

Exploits

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

Solutions

Fireware OS 2026.2.2, Fireware OS 12.12.2, Fireware OS 12.5.20

Credits

McCaulay Hudson (@_McCaulay) of watchTowr finder

References

https://psirt.watchguard.com/CVE-2026-19318

Problem Types

CWE-121 CWE
CWE-129 CWE
CWE-191 CWE