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How the CVE Works
The CVE-2025-7909 vulnerability exists in the D-Link DIR-513 router’s Boa webserver component, specifically in the `/goform/formLanSetupRouterSettings` file. The `sprintf` function improperly handles the `curTime` parameter, allowing uncontrolled data copying into a fixed-size stack buffer. Attackers can remotely trigger this buffer overflow by sending crafted HTTP requests containing oversized `curTime` values. This leads to memory corruption, potentially enabling arbitrary code execution with root privileges since the webserver runs with elevated permissions. The lack of bounds checking and unsupported firmware status exacerbates the risk.
DailyCVE Form
Platform: D-Link DIR-513
Version: 1.0
Vulnerability: Stack Overflow
Severity: Critical
Date: 07/25/2025
Prediction: No Patch
What Undercode Say
curl -X POST -d "curTime=$(python -c 'print("A"500)')" http://target/goform/formLanSetupRouterSettings
import requests
payload = "A" 500
requests.post("http://[bash]/goform/formLanSetupRouterSettings", data={"curTime": payload})
How Exploit
Remote HTTP request
Overflow curTime parameter
Execute arbitrary code
Protection from this CVE
Discontinue device use
Network segmentation
No firmware update
Impact
Full device compromise
Network infiltration
Permanent risk
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
