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Fireware CVE-2025-9242

CRITICAL
Out-of-bounds Write (CWE-787)
2025-09-17 5d1c2695-1a31-4499-88ae-e847036fd7e3
9.3
CVSS 4.0
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CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
Analysis Generated
Mar 28, 2026 - 19:12 vuln.today
Added to CISA KEV
Nov 14, 2025 - 02:00 cisa
CISA KEV
PoC Detected
Nov 14, 2025 - 02:00 vuln.today
Public exploit code
CVE Published
Sep 17, 2025 - 08:15 nvd
CRITICAL 9.3

DescriptionNVD

An Out-of-bounds Write vulnerability in WatchGuard Fireware OS may allow a remote unauthenticated attacker to execute arbitrary code. This vulnerability affects both the Mobile User VPN with IKEv2 and the Branch Office VPN using IKEv2 when configured with a dynamic gateway peer.This vulnerability affects Fireware OS 11.10.2 up to and including 11.12.4_Update1, 12.0 up to and including 12.11.3 and 2025.1.

AnalysisAI

WatchGuard Fireware OS contains an out-of-bounds write in IKEv2 VPN handling enabling unauthenticated remote code execution on WatchGuard firewalls.

Technical ContextAI

The CWE-787 OOB write in IKEv2 processing allows crafted VPN negotiation packets to corrupt memory and achieve code execution on the firewall.

RemediationAI

Update Fireware OS. Disable IKEv2 VPN if not required. Monitor for exploitation indicators.

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CVE-2025-9242 vulnerability details – vuln.today

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