CVE-2025-70232 is a stack-based buffer overflow vulnerability identified in the D-Link DIR-513 router firmware version 1.10. The flaw exists in the handling of the curTime parameter within the goform/formSetMACFilter endpoint, which is part of the router’s web management interface. An attacker can send a specially crafted HTTP request to this endpoint, overflowing the stack buffer and enabling arbitrary code execution. This vulnerability does not require any authentication or user interaction, making it remotely exploitable by any attacker with network access to the device’s management interface. The vulnerability is classified under CWE-121 (Stack-based Buffer Overflow), which typically allows attackers to overwrite return addresses or function pointers, leading to control over the execution flow. The CVSS v3.1 base score of 9.8 indicates critical severity, with attack vector being network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and complete impact on confidentiality (C:H), integrity (I:H), and availability (A:H). Although no public exploits or patches are currently available, the vulnerability poses a severe risk due to the potential for full device compromise, which could be leveraged for network pivoting, data interception, or denial of service. The lack of patch availability means affected organizations must rely on interim mitigations and vigilant monitoring.

The impact of CVE-2025-70232 is severe for organizations using the D-Link DIR-513 router, particularly version 1.10. Successful exploitation allows remote attackers to execute arbitrary code with the privileges of the router’s web server process, potentially leading to full device compromise. This can result in unauthorized access to internal networks, interception or manipulation of network traffic, disruption of network availability, and the establishment of persistent backdoors. Given the router’s role as a network gateway, compromise could facilitate lateral movement within organizational networks, exposing sensitive data and critical systems. The vulnerability’s remote and unauthenticated nature increases the likelihood of exploitation, especially in environments where the router’s management interface is exposed to untrusted networks or the internet. The absence of patches exacerbates the risk, leaving organizations vulnerable until a fix is released. This threat is particularly critical for small and medium enterprises and home users relying on this device for network security and connectivity.

1. Immediately disable remote management interfaces on the D-Link DIR-513 router to prevent external access to the vulnerable endpoint. 2. Restrict access to the router’s web management interface to trusted internal networks only, using firewall rules or network segmentation. 3. Monitor network traffic for unusual or suspicious HTTP requests targeting the goform/formSetMACFilter endpoint or other router management URLs. 4. Implement network intrusion detection/prevention systems (IDS/IPS) with signatures or anomaly detection capable of identifying exploitation attempts targeting this vulnerability. 5. Regularly audit and update router firmware; although no patch is currently available, subscribe to D-Link security advisories to apply updates promptly once released. 6. Consider replacing affected devices with models that have received security updates if immediate patching is not feasible. 7. Educate network administrators about this vulnerability and enforce strong network security policies to minimize exposure. 8. Employ network segmentation to isolate critical systems from devices that cannot be immediately secured.