CVE-2026-78010 Fireware OS Stack-Based Buffer Overflow in iked Allows Unauthenticated Denial of Service
Remote unauthenticated attackers can cause a denial of service in VPN processing via a stack-based buffer overflow 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-2026-78010?
CVE-2026-78010 is a high-severity memory corruption 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
A stack-based buffer overflow vulnerability in the WatchGuard Fireware OS iked process iallows 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-2026-78010?
How do I fix CVE-2026-78010?
No fix has been published for CVE-2026-78010 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-78010 being exploited?
There is no known exploitation of CVE-2026-78010 in the wild and no public exploit code.
Sources
Also known as GHSA-hjxc-cxcg-9xjh.