What’s Vulnerable › Vulnerabilities

CVE-2019-20634

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-03-30 · updated 2026-06-17
• Weakness: CWE-697

Description

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: through 2019-09-08

References

• https://github.com/moohax/Proof-Pudding
• https://github.com/moohax/Talks/blob/master/slides/DerbyCon19.pdf
• https://www.proofpoint.com/us/security/CVE-2019-20634
• https://www.proofpoint.com/us/security/security-advisories/pfpt-sn-2020-0001
• https://atlas.mitre.org/studies/AML.CS0008
• https://github.com/moohax/Proof-Pudding
• https://github.com/moohax/Talks/blob/master/slides/DerbyCon19.pdf
• https://www.proofpoint.com/us/security/CVE-2019-20634
• https://www.proofpoint.com/us/security/security-advisories/pfpt-sn-2020-0001

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