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How the CVE Works
The vulnerability in TOTOLINK T10 (4.1.8cu.5207) resides in the `UploadCustomModule` function within /cgi-bin/cstecgi.cgi. A buffer overflow occurs when handling the `File` parameter in POST requests due to insufficient bounds checking. Attackers can remotely exploit this by sending a crafted payload, leading to arbitrary code execution or system crashes. The flaw stems from improper input validation, allowing an attacker to overwrite adjacent memory regions. Publicly disclosed exploits increase the risk of widespread attacks.
DailyCVE Form
Platform: TOTOLINK T10
Version: 4.1.8cu.5207
Vulnerability: Buffer Overflow
Severity: Critical
Date: 06/16/2025
Prediction: Patch by 07/15/2025
What Undercode Say
Analytics:
curl -X POST -d "File=AAAAAAAA..." http://target/cgi-bin/cstecgi.cgi
payload = b"A" 1024 + struct.pack("<I", 0xdeadbeef)
requests.post("http://target/cgi-bin/cstecgi.cgi", data={"File": payload})
How Exploit
– Craft oversized `File` parameter in POST request.
– Overwrite return address to redirect execution.
– Deploy shellcode for RCE or DoS.
Protection from this CVE
– Apply vendor patch.
– Disable `/cgi-bin/cstecgi.cgi` if unused.
– Implement input validation.
Impact
– Remote code execution.
– System compromise.
– Unauthorized access.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
