Buffer Overflow Vulnerability in WatchGuard Fireware OS Management Web UI
CVE-2026-78008

8.6HIGH

Key Information:

Vendor

Watchguard

Status
Fireware Os
Vendor
CVE Published:
27 August 2026

Badges

👾 Exploit Exists

What is CVE-2026-78008?

This vulnerability in the WatchGuard Fireware OS Management Web UI allows an authenticated administrator to unintentionally compromise system integrity. By sending specifically crafted network traffic, a malicious actor can cause a denial of service (DoS) condition, disrupting legitimate administrative tasks, or potentially execute arbitrary code, posing significant security risks to affected systems. Organizations using impacted versions are advised to implement mitigations and apply necessary patches.

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-2026-78008
vendor-advisory

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
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

Cody Sixteen
.