CVE-2026-78011

Published Aug 28, 2026 CWE-191 CWE-787

Description

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.

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Weakness Type (CWE)

CWE-191 CWE-191
CWE-787 Out-of-bounds Write

References

Frequently Asked Questions

What is CVE-2026-78011? +
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.
How do I check if I'm vulnerable to CVE-2026-78011? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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