CVE-2025-9242criticalunder attackCWE-787

CVE-2025-9242: critical vulnerability in WatchGuard Fireware OS

WatchGuard Firebox iked Out of Bounds Write Vulnerability

Published · Updated

Follow this CVE+ Monitor Fireware OS+ Monitor Firebox

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

100Vexday Risk Score

Prioritize patching. It under exploitation confirmed by CISA and has a public proof of concept.

ssvc Actcvss 9.3epss 92%
from disclosure to weapon14 days
Published on NVDSep 17
1st PoC+14d
CISA KEV+56d
Action required by CISAfederal deadline: 2025-12-03

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

In short

A memory error in WatchGuard Firebox VPN software allows an attacker on the network to write data outside allocated memory, potentially taking over the device. This affects VPN connections used for remote workers and branch office access.

Technical detail

An out-of-bounds write vulnerability in the iked daemon of Fireware OS affects Mobile User VPN and Branch Office VPN implementations using IKEv2 with dynamic gateway peers. Remote, unauthenticated attackers can exploit improper buffer handling to execute arbitrary code with device privileges; vulnerable versions include 11.10.2–11.12.4_Update1, 12.0–12.11.3, and 2025.1.

Summary generated and translated by AI from the official 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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
WatchGuard · Fireware OS
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — WatchGuard Fireware OS

In the same product, most dangerous first.

CVE-2025-14733CRITICALWatchGuard Firebox iked Out of Bounds Write VulnerabilityEPSS 29.4%KEVCVE-2026-3342HIGHWatchGuard Firebox Out of Bounds Write VulnerabilityEPSS 6.4%CVE-2022-31749MEDIUMAuthenticated arbitrary file read/write in WatchGuard Fireware OSEPSS 1.3%CVE-2024-5974HIGHFirebox Authenticated Buffer Overflow VulnerabilityEPSS 1.1%CVE-2026-13368CRITICALWatchGuard Firebox Race Condition and Use-After-Free in Mobile VPN with IKEv2 LDAP AuthenticationEPSS 0.9%CVE-2026-1498HIGHWatchGuard Firebox LDAP InjectionEPSS 0.9%