PCI compliance failure: Attempts some buffer overflows

1157540 pts.
Tags:
PCI compliance
PCI DSS
SFTP
We were PCI compliant for several months straight and all of a sudden, we got this:
Fail
Serious
Port: 21 
Protocol: tcp
Summary : attempts some buffer overflows
CVSS Base Score : 10.0 (CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C) 
CVSS Temporal Score : 8.3 (CVSS2#E:F/RL:OF/RC:C) 
Public Exploit Available : true
CVE : CVE-1999-0219, CVE-2000-0870, CVE-2000-0943, CVE-2000-1035, CVE-2000-1194, 
CVE-2002-0126, CVE-2003-0271, CVE-2005-0634, CVE-2005-1415 
BID : 269, 1227, 1675, 1690, 1858, 3884, 7251, 7278, 7307, 12704, 13454
But our server has cPHulk Brute Force protection on and FTP users are required to use SFTP. Can we secure this anymore? We don't want to change anymore settings. Thanks so much.
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