CVE-2026-106170 in FortiSandbox
Summary
by MITRE • 10/13/2026
An Uncaught Exception vulnerability [CWE-248] vulnerability in Fortinet FortiSandbox 5.2.0 through 5.2.1, FortiSandbox 5.0.0 through 5.0.6, FortiSandbox 4.4 all versions may allow a privileged attacker to deny access to the GUI and CLI persistently via crafted HTTP requests.
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified as CVE-2023-XXXXX represents an Uncaught Exception flaw within the web interface of Fortinet FortiSandbox appliances running specific legacy versions including 5.2.0 through 5.2.1, 5.0.0 through 5.0.6, and all iterations of version 4.4. This defect is categorized under CWE-248, which describes the failure to handle an exception properly in software code. In this specific context, the vulnerability arises from insufficient error handling mechanisms within the HTTP request processing logic of the FortiSandbox management interface. When a privileged attacker submits specially crafted HTTP requests containing malformed or unexpected data structures, the application fails to catch and manage the resulting runtime errors. Instead of gracefully returning an error message or resetting the session state, the underlying process crashes or enters an unrecoverable loop, leading to a persistent denial of service condition for administrative access channels.
From a technical perspective, this vulnerability exploits the lack of robust input validation and exception handling in the server-side components responsible for processing management interface requests. The attacker must possess valid credentials with privileged access levels to trigger this flaw, as the vulnerable endpoints are typically restricted to authenticated administrators. By sending crafted HTTP packets that induce an unhandled exception state within the application logic, the attacker causes the graphical user interface and command-line interface services to become unresponsive or crash repeatedly upon subsequent attempts by legitimate users to connect. This persistence distinguishes it from transient crashes, as the system may require a manual restart of specific service daemons or even a full appliance reboot to restore normal functionality, thereby creating a sustained availability gap for security operations teams relying on these interfaces for threat analysis and policy management.
The operational impact of this vulnerability is significant due to its effect on the availability of critical security infrastructure components. FortiSandbox serves as an essential tool for deep packet inspection and malware analysis within enterprise networks. When administrators lose persistent access to both the GUI and CLI, they are unable to perform routine maintenance, update threat signatures, analyze suspicious files, or adjust sandboxing policies in real-time. This disruption can lead to a blind spot in the organization's defense-in-depth strategy, potentially allowing malicious payloads that would have been detected by the sandbox to pass through undetected. Furthermore, the need for manual intervention to restore service increases operational overhead and may delay incident response efforts during active security events where timely access to forensic tools is paramount.
Mitigation strategies primarily involve upgrading the FortiSandbox software to a version not affected by this flaw, as vendor patches typically include enhanced input validation and proper exception handling routines that prevent such crashes from occurring. For environments where immediate patching is not feasible due to operational constraints or compatibility testing requirements, network-level controls should be implemented to restrict access to the management interfaces exclusively to trusted IP addresses using firewalls or VPN tunnels. Additionally, implementing strict authentication monitoring can help detect attempts by attackers to probe for this vulnerability through repeated failed login attempts followed by crafted request patterns. Regular security audits and adherence to secure coding standards that mandate comprehensive error handling are also recommended to prevent similar CWE-248 vulnerabilities in future software deployments.