CVE-2026-19315 in Fireware OS
Summary
by MITRE • 08/28/2026
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.
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Analysis
by VulDB Data Team • 08/28/2026
The identified security flaw resides within the Internet Key Exchange daemon, commonly referred to as iked, which is a critical component of the WatchGuard Fireware operating system responsible for managing IPsec tunnel negotiations and key exchanges. This specific vulnerability manifests as a type confusion error, a class of software defects where an object or variable is treated as a different data type than its actual declaration during runtime execution. In the context of network-facing services like iked, such errors typically arise when parsing incoming packets that contain malformed or unexpectedly structured fields. When the daemon processes specially crafted network traffic designed to exploit this logic error, it misinterprets memory structures, leading to incorrect pointer arithmetic or invalid function calls based on corrupted type information.
From a technical perspective, type confusion vulnerabilities are particularly dangerous because they bypass standard static analysis checks and can often be triggered remotely without requiring any form of authentication. The attacker leverages the lack of strict input validation within the iked process to send packets that force the application into an unexpected state. By manipulating specific fields in the IKE negotiation messages, the malicious actor causes the system to execute code at arbitrary memory addresses or overwrite critical control data structures such as return pointers on the stack or function tables in heap-allocated objects. This loss of type integrity effectively neutralizes many modern exploit mitigation techniques that rely on predictable memory layouts and strict typing rules, thereby providing a reliable pathway for remote code execution.
The operational impact of this vulnerability is severe, granting an unauthenticated attacker full control over the affected firewall device. Since iked operates with high privileges to manage network security policies and encryption keys, successful exploitation allows the adversary to inject arbitrary commands into the system context. This can lead to a complete compromise of the host, enabling the attacker to pivot laterally across the protected network segment, exfiltrate sensitive data, install persistent backdoors, or disrupt critical network services by altering firewall rules and routing tables. The ability to execute code remotely without authentication significantly lowers the barrier for entry, making this vulnerability attractive to both automated scanning bots and targeted threat actors seeking initial access points within enterprise perimeters.
To mitigate the risks associated with this type confusion flaw, immediate action is required at the infrastructure level while vendor patches are being deployed. Organizations should prioritize applying the official security updates released by WatchGuard that address the input validation logic in the iked process. In environments where patching cannot be implemented immediately due to operational constraints or testing requirements, network segmentation strategies must be employed to restrict access to the management interfaces and IKE service ports from untrusted networks. Additionally, deploying intrusion prevention systems with signatures capable of detecting malformed IKE packets can provide a layer of defense in depth by blocking exploit attempts before they reach the vulnerable daemon. Continuous monitoring for anomalous traffic patterns related to IPsec negotiations is also recommended to detect potential exploitation activities early.