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How CVE-2025-5912 Works
The vulnerability exists in the `do_file` function of the HTTP POST request handler in D-Link DIR-632 firmware version FW103B08. When processing specially crafted HTTP POST requests, the function fails to properly validate input length before copying data to a fixed-size stack buffer. This allows attackers to overwrite adjacent memory regions, including return addresses, enabling remote code execution. The attack requires no authentication and can be performed over the network. Since the device is no longer supported, no official patch is expected from the vendor.
DailyCVE Form
Platform: D-Link DIR-632
Version: FW103B08
Vulnerability: Stack overflow
Severity: Critical
Date: 06/10/2025
Prediction: Unpatched (EOL)
What Undercode Say
curl -X POST -d "A2048" http://target/endpoint
import socket payload = b"A"1024 + ret_addr s.send(b"POST / HTTP/1.1\r\nHost: target\r\nContent-Length: " + str(len(payload)) + b"\r\n\r\n" + payload)
How Exploit
Overflow stack via long HTTP POST
Control EIP/RIP register
Execute arbitrary shellcode
Protection from this CVE
Discontinue device use
Network segmentation
Third-party firmware
Impact
Remote code execution
Device compromise
Network infiltration
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
