CVEs / CVE-2025-9242
CVE-2025-9242: WatchGuard Firebox Out-of-Bounds Write Vulnerability
- Known exploited in the CISA KEV catalog since 12 Nov 2025
- critical 9.8 CVSS 3.1 (NVD)
- EPSS 92.2% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
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.
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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| WatchGuard Fireware OS | from 11.0, up to and including 11.12.4+541730 | — |
| WatchGuard Fireware OS | from 12.0, before 12.11.4 | 12.11.4 |
| WatchGuard Fireware OS | from 2025.0, before 2025.1.1 | 2025.1.1 |
| WatchGuard Fireware OS | from 12.0, before 12.3.1+722811 | 12.3.1+722811 |
| WatchGuard Fireware OS | from 12.0, before 12.5.13 | 12.5.13 |
Exploitation
| In CISA KEV since | 12 Nov 2025 |
|---|---|
| Due date for US federal agencies | 3 Dec 2025 |
| Used in ransomware campaigns | Unknown |
| 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. |
Severity
| CVSS 3.1 | 9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HScored by NVD |
|---|---|
| Weakness | CWE-787 |
References
- CVE-2025-9242 on NVD
- CVE-2025-9242 in the CISA KEV catalog
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00015 (cited by CISA)
- https://psirt.watchguard.com/CVE-2025-9242 Broken Link
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00015 Vendor Advisory
- https://github.com/watchtowrlabs/watchTowr-vs-WatchGuard-CVE-2025-9242/blob/main/watchTowr-vs-WatchGuard-CVE-2025-9242.py Exploit
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-9242 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.