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The CVE-2025-70250 vulnerability is a stack-based buffer overflow residing in the D-Link DIR-513 router specifically on firmware version 1.10. The flaw is triggered through the web management interface’s “formdumpeasysetup” component, accessible via the “/goform/formdumpeasysetup” endpoint. The vulnerability exists due to improper validation of the ‘curTime’ parameter in HTTP POST requests. When an attacker sends a crafted request with a ‘curTime’ value that exceeds the allocated buffer size on the stack, it overwrites adjacent memory regions. This memory corruption can redirect the program flow, allowing an unauthenticated, remote attacker to execute arbitrary code with root privileges on the device. Successful exploitation leads to full device compromise, enabling attackers to monitor network traffic, pivot to internal hosts, or add the router to a botnet. No authentication is required, making this wormable in nature if the management interface is exposed to the internet. Public proof-of-concept exploits are available, increasing the risk of mass exploitation. The vendor has not released a patch as the device is likely end-of-life, leaving users vulnerable indefinitely.
dailycve form:
Platform: D-Link DIR-513
Version: v1.10
Vulnerability : Stack Buffer Overflow
Severity: Critical
date: March 9, 2026
Prediction: Likely never (EOL)
What Undercode Say:
Analytics:
- The exploit does not require authentication, significantly increasing the attack surface.
- Public proof-of-concept code is available on GitHub .
- The device is end-of-life, meaning no official patch will be released.
- Successful exploitation grants root access on the device.
- The vulnerability is wormable if the management interface is exposed to the internet.
Commands:
Discover vulnerable devices using curl
curl -s http://<target_ip>/goform/formdumpeasysetup --data "curTime=$(python3 -c 'print("A" 500)')"
Simple Proof of Concept (Do not use on unauthorized systems)
!/bin/bash
IP="192.168.0.1"
PAYLOAD=$(python3 -c 'print("A" 500)')
curl -X POST http://$IP/goform/formdumpeasysetup -d "curTime=$PAYLOAD"
Check if device is vulnerable by banner grabbing
nc -nv <target_ip> 80
HEAD / HTTP/1.0
Network detection rule for Snort
alert tcp $EXTERNAL_NET any -> $HOME_NET 80 (msg:"CVE-2025-70250 D-Link DIR-513 curTime Overflow"; content:"POST"; http_method; content:"/goform/formdumpeasysetup"; http_uri; content:"curTime="; http_client_body; pcre:"/curTime=[^ ]{250,}/"; sid:10000001; rev:1;)
Exploit:
- Exploitation occurs via an HTTP POST request to
/goform/formdumpeasysetup. - The `curTime` parameter is supplied with an excessively long string.
- The lack of bounds checking on the stack leads to memory corruption.
- Attackers can overwrite the return address on the stack to redirect execution to shellcode.
- Public exploits use this method to spawn a reverse shell or inject malicious firmware.
- The attack is remotely exploitable without any user interaction.
Protection from this CVE:
- Immediately isolate the device from the internet and untrusted networks.
- Disable remote management features if the device must remain in use.
- Replace the end-of-life D-Link DIR-513 with a supported router model.
- Implement firewall rules to block access to port 80/443 from WAN side.
- Monitor for anomalous POST requests to the “/goform/formdumpeasysetup” endpoint.
- Use network segmentation to contain the router in a separate VLAN.
- If replacement is not possible, strictly limit administrative access to local LAN only.
Impact:
- Full remote code execution as root on the device.
- Complete compromise of network confidentiality and integrity.
- Attacker can intercept, modify, or drop network traffic passing through the router.
- Device can be used as a foothold to attack internal network hosts.
- Potential for the router to be recruited into a DDoS botnet (e.g., Mirai).
- Denial of service condition if the overflow causes the device to crash.
- No official fix available, creating a permanent risk for users still operating this hardware.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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