Exploited vulnerability · CISA KEV

Is CVE-2025-9242 exploited? Yes: in CISA KEV since 12 Nov 2025

Gociux · WatchGuard Firebox · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-9242, WatchGuard Firebox Out-of-Bounds Write Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 12 Nov 2025, 56 days after it was published. It affects WatchGuard Firebox, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What it is

WatchGuard Firebox contains an out-of-bounds write vulnerability in the OS iked process that may allow a remote unauthenticated attacker to execute arbitrary code.

What to do

1. Check whether you run it. Look for Firebox in your asset inventory, including appliances and cloud images. Stack check lists every exploited WatchGuard CVE at once.
2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 17 Sep 2025.
4. Get told next time. Email alerts when CISA adds a CVE for WatchGuard.

Other exploited CVEs in Firebox

• CVE-2025-14733: WatchGuard Firebox Out of Bounds Write Vulnerability (19 Dec 2025)

References

• www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00015
• nvd.nist.gov/vuln/detail/CVE-2025-9242

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in November 2025 · WatchGuard scorecard · act-now radar.