AntiVirus Plus "Scan SSL" uses specially-generated BitDefender root security certificates so that BitDefender can do what amounts to a MITM (man-in-the-middle) attack to monitor the PC's SSL-encrypted traffic for malware.
Unfortunately, this may expose a PC to the FREAK attack vulnerability widely reported since its disclosure on 3 March 2015 (see https://grahamcluley.com/2015/03/freak-atta...u-need-to-know). If you navigate to the FREAK test site at https://freakattack.com/ or https://freakattack.com/clienttest.html, you will probably receive a warning that your browser is flagged as vulnerable if you have "Scan SSL" turned on and are therefore using BitDefender substitute security certificates.
I have not found any announcements from BitDefender on this issue yet, but until BitDefender can reassure its customers that "Scan SSL" does not expose users to FREAK attacks, I shall be keeping it turned off.