Stack-Based Buffer Overflow in WatchGuard Fireware OS
CVE-2026-78010

8.7HIGH

Key Information:

Vendor

Watchguard

Status
Fireware Os
Vendor
CVE Published:
27 August 2026

Badges

👾 Exploit Exists

What is CVE-2026-78010?

A stack-based buffer overflow vulnerability exists in the iked process of the WatchGuard Fireware OS. This flaw allows remote unauthenticated attackers to disrupt VPN functionality by sending specially crafted network traffic, potentially leading to a Denial of Service (DoS) condition. The vulnerability compromises the integrity of network security measures and necessitates immediate attention to mitigate the associated risks effectively.

Affected Version(s)

Fireware OS Default 2025.0 < 2026.2.2

Fireware OS Default 12.0 < 12.12.2

Fireware OS Default 2026.3 < 2026.3.1

References

https://psirt.watchguard.com/CVE-2026-78010
vendor-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Discovered Internally by WatchGuard AI Security Research
.