CVE-2025-10034 is a high-severity buffer overflow vulnerability identified in the D-Link DIR-825 router, specifically version 1.08.01. The flaw exists in the get_ping6_app_stat function within the ping6_response.cg component of the embedded HTTP server (httpd). The vulnerability arises from improper handling of the ping6_ipaddr argument, which can be manipulated remotely to trigger a buffer overflow condition. This type of vulnerability allows an attacker to overwrite memory beyond the intended buffer boundaries, potentially leading to arbitrary code execution, denial of service, or system compromise. The attack vector is network-based and does not require user interaction or authentication, making it highly exploitable. Although the affected product is no longer supported by D-Link, the exploit code has been publicly disclosed, increasing the risk of exploitation by threat actors. The CVSS 4.0 base score of 8.7 reflects the critical nature of the vulnerability, with high impact on confidentiality, integrity, and availability, and low attack complexity. The vulnerability affects only the specific firmware version 1.08.01 of the DIR-825 model, which is a consumer-grade wireless router commonly used in home and small office environments. No official patches or mitigations have been released by the vendor due to the product's end-of-life status, leaving users reliant on alternative protective measures.

For European organizations, the impact of this vulnerability can be significant, especially for small businesses and home offices that rely on the D-Link DIR-825 router for network connectivity. Successful exploitation could allow attackers to gain unauthorized access to internal networks, intercept or manipulate sensitive data, disrupt network availability, or use compromised devices as footholds for further attacks. Given the remote exploitability without authentication, attackers could scan for vulnerable devices across Europe and launch automated attacks. This could lead to data breaches, service interruptions, and potential lateral movement within corporate networks if these routers are part of the perimeter defense. Furthermore, the lack of vendor support and patches increases the risk exposure, as organizations cannot rely on firmware updates to remediate the issue. The vulnerability also poses risks to critical infrastructure sectors if these routers are deployed in less secure environments or as part of legacy network setups.

Since no official patches are available, European organizations should take immediate steps to mitigate the risk. First, identify and inventory all D-Link DIR-825 devices running firmware version 1.08.01. Where possible, replace these devices with currently supported models that receive regular security updates. If replacement is not immediately feasible, isolate vulnerable routers from critical network segments and restrict inbound traffic to the management interface using firewall rules or network segmentation. Disable IPv6 ping response functionality if configurable, as this is the attack vector. Employ network intrusion detection/prevention systems (IDS/IPS) to monitor and block suspicious traffic targeting the ping6_ipaddr parameter. Regularly monitor network logs for signs of exploitation attempts. Additionally, educate users about the risks of using unsupported hardware and encourage timely hardware lifecycle management. Finally, consider deploying compensating controls such as VPNs or secure tunnels to reduce exposure of vulnerable devices to the internet.