Heap-Based Buffer Overflow in Fireware OS Authentication Service by WatchGuard
CVE-2026-112709

9.2CRITICAL

Key Information:

Vendor

Watchguard

Status
Fireware Os
Vendor
CVE Published:
27 October 2026

Badges

👾 Exploit Exists

What is CVE-2026-112709?

A heap-based buffer overflow vulnerability exists in the authentication service of Fireware OS. This flaw can be exploited by an attacker who manages to control or intercept communication with the configured Active Directory server. By crafting a malicious response, the attacker could create a denial of service condition and potentially execute arbitrary code, posing a significant risk to system integrity and availability.

Affected Version(s)

Fireware OS Default 2025.1 < 2026.4

Fireware OS Default 12.0 < 12.12.4

Fireware OS T15/T35 12.0 < 12.5.22

References

https://psirt.watchguard.com/CVE-2026-112709
vendor-advisory

CVSS V4

Score:
9.2
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

WatchGuard AI Security Research
.