The highly publicized "smiley face" backdoor exploit ( :) ) that opens port 6200 applies specifically to vsftpd 2.3.4 (CVE-2011-2523), not 2.0.8.
When security researchers search GitHub for VSFTPD exploits, they are usually looking for the infamous . The 2.3.4 Poisoned Archive vsftpd 2.0.8 exploit github