Buffer overflow in Watchguard Fireboxcloud
CVE-2025-9242
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 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.
EPSS exploit prediction
EPSS: 0.918 (99.8th percentile), scored .
High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.913 · newest: 0.918 · change: +0.005
Affected products
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
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.
Public proof-of-concept exploits
References
- 5d1c2695-1a31-4499-88ae-e847036fd7e3 (vendor-advisory, Vendor Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
- 5d1c2695-1a31-4499-88ae-e847036fd7e3 (vendor-advisory, Broken Link)
Frequently asked questions
- What is CVE-2025-9242?
- CVE-2025-9242 is a critical-severity vulnerability in Watchguard Fireboxcloud, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2025-09-17.
- How severe is CVE-2025-9242?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2025-9242 known to be exploited?
- Yes. CVE-2025-9242 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-11-12), indicating it is being actively exploited. 5 public proof-of-concept repositories are indexed.