CVE-2024-40536 identifies a stack overflow vulnerability in Shenzhen Libituo Technology Co., Ltd's LBT-T300-T400 devices, specifically in version 3.2 or related firmware, within the config_3g_para function. The vulnerability arises from improper handling of the pin_3g_code parameter, which can be manipulated to overflow the stack. This is classified under CWE-120, indicating a classic stack-based buffer overflow. Exploitation requires no privileges or user interaction and can be performed remotely over the network (AV:N, PR:N, UI:N). The impact is limited to availability (A:L), as the overflow can cause the device to crash or reboot, resulting in denial of service. There is no impact on confidentiality or integrity. The CVSS v3.1 base score is 5.3, reflecting medium severity. No known exploits have been reported in the wild, and no patches have been released at the time of publication. The affected versions are not clearly enumerated, but the mention of v3.2 suggests firmware or software versioning. The vulnerability affects embedded telecommunications devices that may be used in 3G network configurations, potentially impacting network stability if exploited. The lack of authentication requirements and remote exploitability increase the risk profile, especially in exposed network environments.

The primary impact of CVE-2024-40536 is denial of service through device crashes or reboots caused by the stack overflow. For organizations relying on Shenzhen Libituo LBT-T300-T400 devices in their telecommunications or network infrastructure, exploitation could lead to temporary loss of connectivity or service interruptions. This can affect operational continuity, especially in environments where these devices serve as critical network components. Since confidentiality and integrity are not impacted, data breaches or unauthorized data manipulation are unlikely. However, availability disruptions can have cascading effects on dependent systems and services. The ease of remote exploitation without authentication increases the risk, particularly if devices are exposed to untrusted networks or the internet. The absence of known exploits currently limits immediate widespread impact, but the vulnerability remains a concern until mitigated. Organizations in sectors such as telecommunications, internet service provision, and critical infrastructure that deploy these devices are at risk of service degradation or outages.

1. Monitor Shenzhen Libituo Technology's official channels for firmware updates or patches addressing CVE-2024-40536 and apply them promptly once available. 2. Implement network segmentation to isolate LBT-T300-T400 devices from untrusted networks, minimizing exposure to remote attackers. 3. Employ firewall rules to restrict access to management interfaces and the vulnerable config_3g_para function, allowing only trusted IP addresses. 4. Use intrusion detection/prevention systems (IDS/IPS) to detect anomalous traffic patterns targeting the pin_3g_code parameter or related functions. 5. Conduct regular vulnerability assessments and penetration testing focusing on embedded network devices to identify similar weaknesses. 6. If possible, disable or restrict 3G configuration interfaces that are not in use to reduce the attack surface. 7. Maintain comprehensive network monitoring to quickly identify and respond to device crashes or unusual reboots indicative of exploitation attempts. 8. Develop incident response plans specifically addressing denial of service scenarios affecting telecommunications hardware.