CVE-2026-10270: D-Link DI-7001 MINI Stack-Based Buffer Overflow in httpd_debug.asp

Technical summary

The vulnerability exists in the sprintf function within /httpd_debug.asp, where the Time parameter is processed without proper bounds checking. This classic stack-based buffer overflow (CWE-119, CWE-121) can be triggered remotely but requires prior authentication. The condition—network-accessible service, low complexity exploitation, and high impact on confidentiality, integrity, and availability—yields a CVSS 3.1 score of 8.8 (HIGH). Public availability of exploit code significantly reduces the barrier to weaponization.

Business impact

Compromise of a D-Link DI-7001 MINI router allows attackers to assume full control of the device and the network it protects. An authenticated attacker can inject malicious code into the router's memory, potentially enabling traffic interception, lateral network movement, DNS hijacking, and persistent backdoor installation. For organizations relying on these devices as network perimeter equipment, this represents a direct threat to network confidentiality and operational integrity.

Affected systems

D-Link DI-7001 MINI 8G routers with firmware version 19.09.19A1 and earlier are vulnerable. Verify your device model (DI-7001MINI-8G) and check your current firmware version in the device administration panel. Firmware updates older than the patched version, and any legacy deployments that have not received security updates, remain at risk.

Exploitability

Exploitation requires valid credentials to access the web administration interface, which may be obtained through common attack vectors (phishing, credential compromise, default credentials). The low attack complexity and remotely-accessible API mean that once a valid user account is compromised, code execution is straightforward. The public release of exploit code and proof-of-concept materials substantially increases the likelihood of opportunistic attacks against unpatched installations. Organizations with exposed router interfaces or weak authentication posture face heightened immediate risk.

Remediation

Priority action: upgrade the router firmware to a version later than 19.09.19A1. Contact D-Link support or consult the device's firmware update portal for availability. Interim compensating controls include: (1) restrict web administration access to trusted IP ranges via firewall rules, (2) enforce strong, unique credentials on all administrative accounts, (3) disable remote management if not required, and (4) monitor administrative interface logs for suspicious activity or failed login attempts.

Patch guidance

D-Link has released firmware updates addressing this vulnerability. Visit the official D-Link support page for the DI-7001MINI-8G model and download the latest available firmware version higher than 19.09.19A1. Before applying patches in production, test in a lab environment. Coordinate rollout with your maintenance windows to minimize service disruption. Document the firmware version and update timestamp for compliance records. If your organization uses managed D-Link devices, contact your vendor or systems integrator for guidance on coordinated patching.

Detection guidance

Monitor for unexpected processes spawned from the httpd daemon or changes to the router's running processes and memory. Inspect web server logs for POST requests to /httpd_debug.asp with unusual parameter values, especially oversized Time parameters. Look for authentication failures followed by rapid administrative access attempts. Intrusion detection signatures targeting CWE-119/CWE-121 stack overflow patterns may trigger on malicious payloads. Conduct firmware integrity verification on affected devices to detect unauthorized modifications.

Why prioritize this

This vulnerability merits high priority due to: (1) CVSS 8.8 (HIGH) with maximum impact to C, I, and A, (2) public exploit availability reducing attack barriers, (3) direct access to network infrastructure enabling broad lateral movement, and (4) the authentication requirement, while protective, does not eliminate risk given credential compromise prevalence. Any D-Link DI-7001 MINI in production should be treated as urgent for patching.

Risk score, explained

The CVSS 3.1 score of 8.8 reflects a remote, unauthenticated network attack surface (AV:N) with low attack complexity (AC:L), a requirement for valid credentials (PR:L), no user interaction needed (UI:N), and high impact across all three security pillars—confidentiality, integrity, and availability (C:H/I:H/A:H). The 'L' in PR:L indicates that an attacker must already have gained a foothold (logged-in user status), which is a realistic scenario given compromised credentials or default passwords. The public disclosure of functional exploit code effectively elevates real-world risk beyond the baseline CVSS calculation.

Frequently asked questions