CVE-2026-78011#
Fireware OS Integer Underflow in Iked Allows Unauthenticated Denial of Service (DoS)
Summary #
An integer underflow vulnerability in the WatchGuard Fireware OS iked process allows 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 #
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