CVE DATABASE / CVE-2025-9242

CVE-2025-9242

WatchGuard Firebox Out-of-Bounds Write Vulnerability

CVSS 9.8 · CRITICAL ⚠ CISA KEV — ACTIVELY EXPLOITED

On the CISA KEV catalog

Confirmed exploited in the wild. Added 2025-11-12. Federal remediation due 2025-12-03.
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Summary

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.

CVSS 3.1 breakdown

Base score	9.8 (CRITICAL)
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector	NETWORK
Attack complexity	LOW
Privileges required	NONE
User interaction	NONE
Scope	UNCHANGED
Confidentiality	HIGH
Integrity	HIGH
Availability	HIGH

Weakness type (CWE)

CWE-787

Affected products

Watchguard firewareWatchguard firebox m270Watchguard firebox m290Watchguard firebox m370Watchguard firebox m390Watchguard firebox m440Watchguard firebox m4600Watchguard firebox m470Watchguard firebox m4800Watchguard firebox m5600Watchguard firebox m570Watchguard firebox m5800Watchguard firebox m590Watchguard firebox m670Watchguard firebox m690Watchguard firebox nv5Watchguard firebox t20Watchguard firebox t25Watchguard firebox t40Watchguard firebox t45

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References

Data: NIST NVD + CISA KEV. NVD last modified 2025-11-14. Always verify against the vendor advisory before acting.