Vulnerability · Published Aug 27, 2026 · Assigned by WatchGuard
CVE-2026-19315Fireware OS Pre-Authentication Type Confusion in iked Allows Remote Code Execution
Critical 9.3
In plain English
A critical-severity out-of-bounds read in Fireware OS from WatchGuard. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).
Severity (CVSS 4.0)9.3Critical
Exploit odds (30 days)0.7%top 46.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
A type confusion vulnerability in the iked process of WatchGuard Fireware OS allows a remote unauthenticated attacker to execute arbitrary code by sending specially crafted network traffic.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| WatchGuard | Fireware OS | 2025.0 – before 2026.2.212.0 – before 12.12.22026.3 – before 2026.3.1 |
| WatchGuard | Fireware OS | 12.0 – before 12.5.20 |
Weakness: CWE-125, CWE-763, CWE-843 · 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
References
- https://psirt.watchguard.com/CVE-2026-19315 vendor-advisory