CVE-2019-20634
CVE-2019-20634 is a low-severity vulnerability in Proofpoint Email Protection with a CVSS 3.x base score of 3.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-697.
Key facts
- Severity: Low (CVSS 3.x base score 3.7)
- CVSS v2: 4.3
- EPSS exploit prediction: 2% (72nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-697
- Affected product: Proofpoint Email Protection
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2019-20634?
- 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.
- How severe is CVE-2019-20634?
- CVE-2019-20634 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
- Is CVE-2019-20634 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2019-20634?
- CVE-2019-20634 affects Proofpoint Email Protection. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2019-20634?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2019-20634 published?
- CVE-2019-20634 was published on 2020-03-30 and last updated on 2026-06-17.
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
Affected products (1)
- cpe:2.3:a:proofpoint:email_protection:*:*:*:*:*:*:*:*
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