Buffer Overflow in WatchGuard Fireware OS Affects Security Devices
CVE-2026-19318

9.3CRITICAL

Key Information:

Vendor

Watchguard

Status
Fireware Os
Vendor
CVE Published:
27 August 2026

Badges

👾 Exploit Exists

What is CVE-2026-19318?

A stack-based buffer overflow vulnerability present in the iked process of WatchGuard Fireware OS can be exploited by remote unauthenticated attackers. By sending specially crafted packets, these attackers are capable of executing arbitrary code on the affected devices. This vulnerability emphasizes the importance of prompt updates to firmware and robust network security measures to mitigate potential threats to system integrity.

Affected Version(s)

Fireware OS Default 2025.0 < 2026.2.2

Fireware OS Default 12.0 < 12.12.2

Fireware OS T15/T35 12.0 < 12.5.20

References

https://psirt.watchguard.com/CVE-2026-19318
vendor-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
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

McCaulay Hudson (@_McCaulay) of watchTowr
.