CVE-2025-9242

CRITICAL9.8

CISA KEV

Published 2025-09-17 · Updated 2026-08-10 · Source 5d1c2695-1a31-4499-88ae-e847036fd7e3

Summary

CVE-2025-9242 is a critical-severity (CVSS 9.8) vulnerability in WatchGuard Firebox. CISA added it to the Known Exploited Vulnerabilities catalog on November 12, 2025, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by December 3, 2025. CISA does not currently list it as used in ransomware campaigns. WatchGuard has 4 vulnerabilities in the KEV catalog, 1 of them linked to ransomware.

All 4 known-exploited WatchGuard vulnerabilities →

Description

An Out-of-bounds Write vulnerability in the WatchGuard Fireware OS iked process 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. If the Firebox was previously configured with the mobile user VPN with IKEv2 or a branch office VPN using IKEv2 to a dynamic gateway peer, and both of those configurations have since been deleted, that Firebox may still be vulnerable if a branch office VPN to a static gateway peer is still configured.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-787

CISA Known-Exploited Vulnerability

Product: WatchGuard — Firebox

Name: WatchGuard Firebox Out-of-Bounds Write Vulnerability

Date added: 2025-11-12 · 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.

References

View on NVD

More exploited WatchGuard vulnerabilities

Most recently added to CISA KEV

CVE-2025-14733
RANSOMWARE
Firebox — WatchGuard Firebox Out of Bounds Write Vulnerability
added 2025-12-19
CVE-2022-23176
Firebox and XTM — WatchGuard Firebox and XTM Privilege Escalation Vulnerability
added 2022-04-11
CVE-2022-26318
Firebox and XTM Appliances — WatchGuard Firebox and XTM Appliances Arbitrary Code Execution
added 2022-03-25

View all →

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