Actively exploited · Published Dec 19, 2025 · Assigned by WatchGuard
CVE-2025-14733WatchGuard Firebox iked Out of Bounds Write Vulnerability
Critical 9.3 Exploited Ransomware
In plain English
A critical-severity out-of-bounds write in Fireware OS from WatchGuard. Attackers are actively exploiting it in the wild (listed by CISA on December 19, 2025). It has been used in ransomware campaigns. The chance it is exploited in the next 30 days is estimated at 29.4% (higher than 98% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA guidance
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Federal agencies must remediate by Dec 26, 2025.
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| WatchGuard | Fireware OS | 2025.1 – before 2025.1.412.0 – before 12.11.611.10.2 – through 11.12.4+541730 |
| WatchGuard | Fireware OS | 12.0 – before 12.3.1+728352 |
| WatchGuard | Fireware OS | 12.0 – before 12.5.15 |
Weakness: CWE-787 · Vector: 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/U:Red
References
- https://psirt.watchguard.com/CVE-2025-14733 vendor-advisory
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00027 vendor-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-14733 government-resource