CVE-2019-20634: Proofpoint Email Protection

Low severity, CVSS 3.7. EPSS: 1.6% chance of exploitation in the next 30 days.

An issue was discovered in Proofpoint Email Protection through 2019-09-08. By collecting scores from Proofpoint email headers, it is possible to build a copy-cat Machine Learning Classification model and extract insights from this model. The insights gathered allow an attacker to craft emails that receive preferable scores, with a goal of delivering malicious emails.

Affected products

• Proofpoint Email Protection: up to and including 2019-09-08

Published 2020-03-30. Last modified 2026-06-17.