CVE-2026-13383 in Fireware OS
Summary
by MITRE • 07/03/2026
An Out-of-bounds Write vulnerability in WatchGuard Fireware OS ikestubd process could allow an authenticated privileged user to execute arbitrary code via a specially crafted requests to the Management Web UI.This vulnerability affects Fireware OS 12.1 up to and including 12.12 and 2025.1 up to and including 2026.2.
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Analysis
by VulDB Data Team • 07/03/2026
This vulnerability represents a critical out-of-bounds write flaw in the ikestubd process of WatchGuard Fireware OS, which operates at the kernel level within the network security appliance ecosystem. The vulnerability specifically affects systems running Fireware OS versions 12.1 through 12.12 and 2025.1 through 2026.2, creating a significant attack surface for authenticated privileged users who can craft malicious requests to the Management Web UI. The technical implementation involves improper bounds checking within the ikestubd daemon responsible for handling IPsec IKE (Internet Key Exchange) protocol operations, allowing an attacker with valid credentials to manipulate memory allocation patterns through crafted API calls.
The operational impact of this vulnerability extends beyond simple privilege escalation as it enables arbitrary code execution at the system level, effectively providing attackers with complete control over affected firewalls. This represents a severe compromise of network security infrastructure since ikestubd processes are integral to VPN connectivity and secure communications within enterprise environments. Attackers leveraging this vulnerability can bypass traditional network segmentation controls, potentially gaining access to sensitive internal networks while maintaining persistent access through the compromised firewall's management interface.
From a cybersecurity framework perspective, this vulnerability maps directly to CWE-787 Out-of-bounds Write, which falls under the broader category of memory safety issues in software development practices. The ATT&CK framework categorizes this as privilege escalation through exploitation of system-level processes, specifically targeting the T1068 Privilege Escalation technique where attackers leverage legitimate system tools to gain elevated privileges. The vulnerability's exploitation pathway aligns with T1566 Initial Access through credential compromise followed by T1059 Command and Scripting Interpreter for executing malicious payloads.
Organizations affected by this vulnerability should immediately implement mitigations including mandatory firmware updates to patched versions, network segmentation to limit management access, and enhanced monitoring of the Management Web UI for suspicious API requests. Additional defensive measures involve implementing strict access controls through role-based permissions, enabling multi-factor authentication for management interfaces, and deploying intrusion detection systems capable of identifying malformed requests targeting the ikestubd process. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches in network infrastructure devices, as privileged authenticated users represent a significant threat vector when system-level memory corruption vulnerabilities exist within core services.
This particular flaw highlights the inherent risks associated with complex network security appliances where kernel-level processes handle sensitive protocol implementations such as IPsec IKE. The attack surface becomes particularly dangerous when management interfaces are accessible from untrusted networks or when administrative credentials are compromised through social engineering attacks. Organizations must recognize that firewalls serve as primary defense mechanisms, making vulnerabilities in their underlying operating systems potentially catastrophic for overall network security posture. The remediation timeline should prioritize immediate patching of affected devices while conducting comprehensive vulnerability assessments to identify any potential exploitation attempts within the network infrastructure.