Listen to this Post
The D-Link DIR-513 router, specifically version 1.10, utilizes the Boa web server to handle administrative web interface requests . This server initializes various service functions, including those that process form inputs via specific callbacks. CVE-2025-70244 is a stack-based buffer overflow vulnerability located in the `goform/formWlanSetup` endpoint. The flaw exists because the `webPage` parameter, supplied in a POST request to this form, is copied into a fixed-size buffer on the stack without any proper length validation. An attacker can craft a malicious HTTP request containing an overly long string for the `webPage` parameter. When the vulnerable function executes, it attempts to write this oversized data into the undersized stack buffer. This action overwrites adjacent memory regions on the stack, including the function’s return address. By carefully controlling the data in the overflow, a remote, unauthenticated attacker can hijack the program’s execution flow. This allows them to redirect the processor to execute arbitrary malicious code of their choice. Successful exploitation grants the attacker complete control over the device, potentially leading to full system compromise . The device is end-of-life and no longer supported, meaning no official patch will be released by the manufacturer .
Platform: D-Link DIR-513
Version: v1.10
Vulnerability : Stack Buffer Overflow
Severity: Critical
date: March 10, 2026
Prediction: No Official Patch
What Undercode Say:
Analytics:
This vulnerability affects an end-of-life device, meaning the attack surface is static and will not be remediated by the vendor. Given the public availability of proof-of-concept exploits for similar buffer overflows in the same device family , the likelihood of exploitation for CVE-2025-70244 is very high. It presents a significant risk to any remaining deployed units, as attackers can easily automate scanning for and compromising these exposed routers.
How Exploit:
The following is a proof-of-concept Bash script using curl to demonstrate how the overflow is triggered by sending an overly long string to the vulnerable `webPage` parameter.
!/bin/bash
PoC for CVE-2025-70244 - D-Link DIR-513 Stack Overflow
Usage: ./poc.sh <router_ip>
TARGET=$1
PAYLOAD=$(python3 -c "print('A' 1000)") Generate long string
echo "Sending exploit payload to $TARGET..."
curl -X POST http://$TARGET/goform/formWlanSetup \
-d "webPage=$PAYLOAD"
echo "Payload sent. Device may crash or become unresponsive."
Protection from this CVE:
As the vendor has not and will not release a patch, the primary mitigation is to isolate or decommission the device. Users should immediately replace the D-Link DIR-513 v1.10 with a supported model. If replacement is not immediately possible, network-level access controls must be implemented. This includes blocking remote access to the device’s management interface from the internet and strictly limiting internal network access to only trusted administrators.
Impact:
Successful exploitation of CVE-2025-70244 allows a remote, unauthenticated attacker to execute arbitrary code with root privileges on the router. This leads to total device compromise, enabling attackers to monitor network traffic, steal sensitive credentials, modify DNS settings to redirect users to malicious sites, and incorporate the device into a botnet for large-scale attacks.
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
