CVE-2026-19317 Fireware OS Pre-Authentication Out-of-Bounds Read in iked Allows Denial of Service (DoS)
Remote unauthenticated attackers can cause a denial of service in VPN processing via crafted traffic in WatchGuard Fireware OS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19317?
CVE-2026-19317 is a high-severity denial of service vulnerability in WatchGuard Fireware OS, published on 27 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An out-of-bounds read 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.
Which versions are affected by CVE-2026-19317?
How do I fix CVE-2026-19317?
No fix has been published for CVE-2026-19317 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-19317 being exploited?
There is no known exploitation of CVE-2026-19317 in the wild and no public exploit code.
Sources
Also known as GHSA-fj8p-qfhx-jffx.