CVE-2020-36971 is a local stack buffer overflow vulnerability in Nidesoft 3GP Video Converter version 2.6.18. The vulnerability exists in the license registration parameter where attackers can craft malicious payloads and paste them into the 'License Code' field. Successful exploitation allows arbitrary code execution on the target system. This is a local vulnerability that requires user interaction to paste the malicious license code. The vulnerability has been documented with proof-of-concept exploits available on Exploit-DB.