CVE-2024-41459 is a stack-based buffer overflow vulnerability identified in the Tenda FH1201 router firmware version 1.2.0.14. The vulnerability arises from improper bounds checking of the PPPOEPassword parameter submitted to the ip/goform/QuickIndex endpoint, which is likely part of the router's web management interface. This flaw allows an attacker with network access and low privileges to send a specially crafted request that overflows the stack buffer, potentially enabling arbitrary code execution on the device. The vulnerability does not require user interaction and can be exploited remotely over the network, increasing its risk profile. The CVSS v3.1 base score is 8.8, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity and no user interaction needed. The vulnerability is classified under CWE-121 (Stack-based Buffer Overflow), a common and dangerous class of memory corruption bugs. No patches or official fixes have been published at the time of disclosure, and no public exploits have been observed in the wild. The lack of authentication requirement (or low privilege) combined with remote exploitability makes this a critical concern for affected users. The vulnerability could allow attackers to take full control of the router, intercept or manipulate network traffic, disrupt connectivity, or use the device as a foothold for further attacks within the network.

The impact of CVE-2024-41459 is significant for organizations using Tenda FH1201 routers, particularly those relying on these devices for internet access or network perimeter security. Successful exploitation can lead to full device compromise, enabling attackers to intercept sensitive data, alter network configurations, disrupt service availability, or pivot to internal networks for further attacks. This can result in data breaches, operational downtime, and loss of trust. Given the router’s role in home and small business networks, the vulnerability could also be exploited to create botnets or launch distributed denial-of-service (DDoS) attacks. The high CVSS score indicates severe consequences if exploited. The absence of patches increases the window of exposure, making proactive mitigation essential. Organizations with limited network segmentation or exposed management interfaces are at elevated risk. The vulnerability could also impact managed service providers and ISPs deploying these routers at scale, amplifying the potential damage.

1. Immediately restrict access to the router’s web management interface (ip/goform/QuickIndex) by limiting it to trusted internal networks and disabling remote management if not required. 2. Implement network segmentation to isolate vulnerable devices from critical infrastructure and sensitive data. 3. Monitor network traffic for unusual requests targeting the PPPOEPassword parameter or suspicious activity on the router’s management interface. 4. Use firewall rules to block unauthorized access attempts to the router’s IP and management ports. 5. Regularly audit and update router firmware; although no patch is currently available, stay alert for vendor updates or security advisories. 6. Consider replacing affected devices with models from vendors with a stronger security track record if patching is not forthcoming. 7. Employ intrusion detection/prevention systems (IDS/IPS) capable of detecting buffer overflow exploit attempts. 8. Educate network administrators about this vulnerability and enforce strong password policies to reduce attack surface. 9. If possible, disable PPPoE services if not in use to reduce exposure. 10. Maintain comprehensive backups and incident response plans to quickly recover from potential compromises.