CVE-2024-46554 in Vigor 3910
Summary
by MITRE • 09/18/2024
Draytek Vigor 3910 v4.3.2.6 was discovered to contain a buffer overflow in the profname parameter at v2x00.cgi. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted input.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 06/15/2025
The vulnerability identified as CVE-2024-46554 affects the Draytek Vigor 3910 router firmware version 4.3.2.6 and represents a critical buffer overflow condition within the web interface administration component. This issue manifests in the v2x00.cgi script where the profname parameter fails to properly validate input length, creating an exploitable condition that can be leveraged by remote attackers to disrupt normal network operations. The affected device operates as a broadband router and firewall appliance commonly deployed in enterprise and small office environments, making this vulnerability particularly concerning given the widespread use of Draytek equipment in network infrastructure. The buffer overflow vulnerability specifically resides in the handling of user-supplied data within the web management interface, where insufficient bounds checking allows malicious input to overwrite adjacent memory regions.
The technical flaw stems from improper input validation mechanisms within the v2x00.cgi script that processes the profname parameter. When an attacker submits a crafted payload containing excessive data in the profname field, the application fails to enforce length limitations, causing the buffer to overflow and potentially corrupt adjacent memory segments. This memory corruption can lead to unpredictable application behavior, including application crashes, system instability, and complete service disruption. The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a classic example of unsafe string handling in web applications. The attack vector is remote and requires no authentication, making it particularly dangerous as it can be exploited by anyone with network access to the device's management interface.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the entire network infrastructure that relies on the affected router. A successful exploitation can result in complete denial of service for network management functions, rendering administrators unable to access or configure the device until manual intervention occurs. This disruption can cascade into broader network issues, particularly in environments where the router serves as a critical gateway or firewall component. Network availability is directly impacted as the device becomes unresponsive to legitimate management requests, potentially requiring physical access or remote console intervention to restore functionality. The vulnerability's remote exploitability means that attackers can target multiple devices simultaneously without requiring physical presence or network credentials, amplifying the potential impact on organizations with numerous affected routers deployed across their network infrastructure.
Mitigation strategies for CVE-2024-46554 should prioritize immediate firmware updates from Draytek, as the vendor has likely released patches addressing this specific buffer overflow condition. Network administrators should implement temporary network segmentation to limit access to the affected device's management interface until proper updates can be deployed. Additional protective measures include disabling unnecessary web management services, implementing network access controls to restrict access to management ports, and monitoring for anomalous traffic patterns that may indicate exploitation attempts. The vulnerability demonstrates the importance of input validation and proper bounds checking in web applications, reinforcing principles from the OWASP Top Ten and MITRE ATT&CK framework's defense evasion techniques. Organizations should also consider implementing intrusion detection systems to monitor for exploitation attempts targeting known vulnerabilities in network infrastructure devices, particularly those commonly targeted in supply chain attacks or network reconnaissance activities.