Critical 9.3Known exploited (CISA KEV)Published Sep 17, 2025

CVE-2025-9242WatchGuard Firebox iked Out of Bounds Write Vulnerability

Updated under an hour ago (2026-10-19 04:50 UTC)

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It affects WatchGuard Fireware OS and 1 other product. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Nov 12, 2025; federal agencies had to remediate by Dec 3, 2025. Treat that date as your deadline.

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Every CVE for WatchGuard Fireware OS

Exploited in the last 30 days

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: 9.3 CRITICAL (v4.0, CNA)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
Weakness (CWE): CWE-787
Known exploited: Added to CISA KEV Nov 12, 2025; federal remediation due Dec 3, 2025Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 91.80% (percentile 100)
Assigned by: WatchGuard
NVD analysis: Analyzed
Record last updated: Aug 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

WatchGuard Fireware OS watchguard:fireware_os (from the name)	from 11.0 through 11.12.4+541730; from 12.0 before 12.11.4; from 2025.0 before 2025.1.1	CNA record
watchguard fireware watchguard:fireware	from 11.10.2 before 12.11.4; from 11.10.2 before 12.5.13; 2025.1	NVD

References

https://psirt.watchguard.com/CVE-2025-9242vendor-advisory, broken-link
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00015vendor-advisory
https://github.com/watchtowrlabs/watchTowr-vs-WatchGuard-CVE-2025-9242/blob/main/watchTowr-vs-WatchGuard-CVE-2025-9242.pyexploit
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-9242us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.