CVE-2019-20634: An issue was discovered in Proofpoint Email Protection through 2019-09-08. By collecting scores from Proofpoint email he

CVE-2019-20634 is a vulnerability in Proofpoint Email Protection where attackers can collect scoring information from email headers to build a copycat machine learning model. By understanding how this model works, attackers can craft malicious emails designed to receive favorable scores and bypass the email filter.