Stack-Based Buffer Overflow in Fireware OS's WireGuard Configuration by WatchGuard
CVE-2026-103594

9.5CRITICAL

Key Information:

Vendor

Watchguard

Status
Fireware Os
Vendor
CVE Published:
27 October 2026

Badges

👾 Exploit Exists

What is CVE-2026-103594?

A stack-based buffer overflow vulnerability in the WireGuard configuration processing of Fireware OS could be exploited by a remote attacker with man-in-the-middle access to the Firebox and WatchGuard Cloud. By manipulating a FireCloud Gateway configuration payload, attackers may initiate a Denial of Service condition or potentially execute arbitrary code, posing significant risks to affected systems.

Affected Version(s)

Fireware OS Default 2026.2 < 2026.4

Fireware OS Default 12.12 < 12.12.4

References

https://psirt.watchguard.com/CVE-2026-103594
vendor-advisory

CVSS V4

Score:
9.5
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
.