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The vulnerability CVE-2025-70225 is a stack-based buffer overflow found in the D-Link DIR-513 router, specifically version 1.10. The flaw exists within the `goform/formEasySetupWWConfig` component, which is part of the device’s web interface. The vulnerability is triggered through improper handling of the `curtime` parameter in HTTP POST requests. When the router’s web server (Boa) processes a request to this endpoint, it copies the value of the `curtime` parameter into a fixed-size buffer on the stack using a function like `sprintf` without properly checking the length of the input . An attacker can send a crafted POST request containing an overly long `curtime` string. This action overflows the stack buffer, overwriting adjacent memory regions. By carefully crafting the overflow data, an attacker can hijack the program’s execution flow to run arbitrary malicious code. Because the router’s web interface is accessible to anyone on the network, this attack can be launched remotely without any authentication. The device is end-of-life, meaning the manufacturer will not release a security patch .
dailycve form:
Platform: D-Link DIR-513
Version: v1.10
Vulnerability : Stack Buffer Overflow
Severity: Critical
date: 2026-03-04
Prediction: No Patch Expected
What Undercode Say:
Analytics:
This vulnerability is similar to others discovered in the D-Link DIR-513, such as CVE-2025-8168 and CVE-2025-8184, which also involve stack overflows via the `curTime` parameter in different form handlers . The prevalence of this issue suggests a systemic lack of input validation across multiple endpoints in the firmware.
The following Proof of Concept (PoC) demonstrates how to trigger the overflow using a `curl` command. A successful exploit would overwrite the return address on the stack.
Example of a basic buffer overflow trigger for CVE-2025-70225
This command sends a long string to the curtime parameter.
A real exploit would replace "A"s with shellcode.
TARGET_IP="192.168.0.1"
PAYLOAD=$(python3 -c 'print("A" 1000)') Length needs to be determined via reverse engineering
curl -X POST http://$TARGET_IP/goform/formEasySetupWWConfig \
-d "curtime=$PAYLOAD"
How Exploit:
The attacker sends a malicious HTTP POST request to the vulnerable endpoint /goform/formEasySetupWWConfig. The `curtime` parameter contains a carefully constructed payload that includes shellcode and a new return address. When the buffer overflows, it redirects the router’s CPU to execute the attacker’s shellcode, granting remote code execution on the device .
Protection from this CVE:
- As the device is end-of-life (EOL) and no patch will be released, the primary mitigation is to replace the D-Link DIR-513 router with a supported model.
- If replacement is not immediately possible, isolate the device by placing it behind a firewall and strictly limiting remote access.
- Disable remote management features and ensure the device is not exposed to the public internet .
Impact:
- Remote Code Execution: An unauthenticated attacker can gain full control of the router.
- Network Compromise: A compromised router can be used to launch attacks on internal network devices or to intercept and modify traffic.
- Denial of Service: Even a basic overflow without shellcode will cause the router to crash, disrupting all network connectivity .
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Sources:
Reported By: nvd.nist.gov
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Hono (Framework), Auth Bypass, CVE-2026-29045 (High)