CVE-2026-19313

CRITICAL CVSS 4.0: 9.3 EPSS 0.47%
Updated Sep 04, 2026
Watchguard
Parameter Value
CVSS 9.3 (CRITICAL)
Affected Versions 12.0 — 2026.2.2
Fixed In 12.5.20
Type CWE-190 (Integer Overflow), CWE-680, CWE-122 (Heap-based Buffer Overflow)
Vendor Watchguard
Public PoC No

An heap overflow vulnerability in the WatchGuard Fireware OS iked process allows a remote unauthenticated attacker to execute arbitrary code by sending specially crafted network traffic.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v4.0

Vulnerable Products 3

Configuration From (including) Up to (excluding)
Watchguard Fireware_Os
cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*
12.0 12.5.20
Watchguard Fireware_Os
cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*
2025.0 2026.2.2
Watchguard Fireware_Os
cpe:2.3:a:watchguard:fireware_os:*:*:*:*:*:*:*:*
12.0 12.12.2