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CVE-2025-14733: WatchGuard Firebox Out of Bounds Write Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2025-12-19
• EPSS: 29.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-19 · updated 2026-09-09
• Weakness: CWE-787

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

• WatchGuard Fireware OS: from 11.10.2 before 12.5.15; from 11.10.2 before 12.11.6; from 2025.1 before 2025.1.4 — fixed in 12.11.6, 12.5.15, 2025.1.4

How to fix

Upgrade to a fixed version: WatchGuard Fireware OS 12.11.6, 12.5.15, 2025.1.4. Check the vendor advisory for mitigations.

References

• https://psirt.watchguard.com/CVE-2025-14733
• https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2025-00027
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-14733

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