Actively exploited in the wild
WatchGuard Firebox Out of Bounds Write Vulnerability
WatchGuard - Firebox · Listed in the CISA KEV since 2025-12-19. This indicates confirmed attacks in production environments.
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.
CVE-2025-14733
CriticalCVSS 9.8KEVExploitation Probability (EPSS)
Very high risk98th percentile - higher than 98% of all known CVEs
Summary
An Out-of-bounds Write vulnerability in the WatchGuard Fireware OS iked process may allow a remote unauthenticated attacker to execute arbitrary code. It affects both mobile user VPN with IKEv2 and branch office VPN using IKEv2 when configured with a dynamic gateway peer. Even after deleting those configurations, if a branch office VPN to a static gateway peer remains, the Firebox may still be vulnerable.
Risk Assessment
Risk of remote unauthenticated takeover of the firewall, potentially compromising network integrity and exposing sensitive data.
Recommendation
Apply available security updates from WatchGuard for Fireware OS. If updating is not possible, consider temporarily disabling or changing IKEv2 VPN configurations to reduce exposure.
Other vulnerabilities in WatchGuard Fireware OS
See all- CVE-2026-93866Critical
An integer overflow vulnerability exists in the WebSocket connection handling used by WatchGuard Fireware OS's Access Portal. A remote, unauthenticated attacker can write beyond the bounds of a heap buffer by sending a specially crafted request while the Access Portal feature is enabled.
- CVE-2026-93865Critical
A missing authentication vulnerability exists in the Fireware OS FireCluster synchronization daemon. A remote, unauthenticated attacker can invoke privileged system-level administrative actions by sending a specially crafted request to the FireCluster management IP when the clustering feature is enabled.
- CVE-2026-93857Critical
A stack-based buffer overflow vulnerability exists in Fireware OS's SIP proxy. A remote, unauthenticated attacker can execute arbitrary code by sending a specially crafted request through a policy that uses the SIP proxy.
- CVE-2026-90465Critical
A missing authentication vulnerability exists in FireCluster Sync processing. An attacker positioned on the cluster interconnect, such as a compromised cluster peer or an on-path network attacker, can invoke privileged firewall management actions as root by sending a specially crafted request.
- CVE-2026-112710Critical
A heap-based buffer overflow vulnerability exists in the Fireware OS authentication service. An attacker who controls or intercepts traffic to the configured Active Directory server can create a denial of service condition and potentially execute arbitrary code by returning a specially crafted response.
- CVE-2026-112709Critical
A heap-based buffer overflow vulnerability exists in the Fireware OS authentication service. An attacker who controls or intercepts traffic to the configured Active Directory server can create a denial of service condition and potentially execute arbitrary code by returning a specially crafted response.
- CVE-2026-103594Critical
A stack-based buffer overflow vulnerability exists in Fireware OS's WireGuard configuration processing. A remote attacker with man-in-the-middle TLS-decrypted access between the Firebox and WatchGuard Cloud can create a denial of service condition and potentially execute arbitrary code by tampering with a FireCloud Gateway configuration payload.
- CVE-2026-86131Critical
A code injection vulnerability in WatchGuard Fireware OS's BOVPN Over TLS client configuration handling allows an attacker who controls the remote VPN server to execute arbitrary commands as root on the connecting Firebox.
- CVE-2026-19318Critical
A stack-based buffer overflow in the iked process of WatchGuard Fireware OS allows a remote unauthenticated attacker to execute arbitrary code by sending specially crafted network traffic.
- CVE-2026-19315Critical
A type confusion vulnerability in the iked process of WatchGuard Fireware OS allows a remote unauthenticated attacker to execute arbitrary code by sending specially crafted network traffic.
Original NVD description (English source)
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 data from NVD (NIST) · CISA KEV · EPSS

