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How CVE-2025-6143 Works
The vulnerability exists in the `/boafrm/formNtp` endpoint of TOTOLINK EX1200T firmware version 4.1.2cu.5232_B20210713. When processing HTTP POST requests, the router fails to properly validate the length of user-supplied input in the `submit-url` parameter. This allows an attacker to send an overly long string, triggering a buffer overflow condition. The lack of bounds checking enables remote code execution with root privileges due to the service running as a privileged process. The exploit leverages crafted HTTP requests to overwrite critical memory addresses.
DailyCVE Form
Platform: TOTOLINK EX1200T
Version: 4.1.2cu.5232_B20210713
Vulnerability: Buffer Overflow
Severity: Critical
Date: 06/16/2025
Prediction: Patch by 08/2025
What Undercode Say
$ curl -X POST -d "submit-url=AAA...<5000 bytes>" http://target/boafrm/formNtp $ nmap -p80 --script http-vuln-cve2025-6143 <target> $ python3 exploit.py -t 192.168.1.1 -p 80
How Exploit
Crafted HTTP POST requests with oversized submit-url parameter trigger memory corruption, allowing arbitrary code execution. Public exploits leverage ROP chains to bypass ASLR.
Protection from this CVE
1. Firmware update
2. Network segmentation
3. Input validation
Impact
1. Remote code execution
2. Full device compromise
3. Network infiltration
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
