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CVE-2019-20634

16
FAUCET Score

CVE-2019-20634 affects Proofpoint Email Protection, allowing attackers to reverse-engineer its email classification model. By analyzing email header scores, an attacker can craft malicious emails designed to bypass filters and achieve delivery. This vulnerability has a low CVSS score of 3.7 due to its high attack complexity and limited impact (information disclosure), with no known active exploitation, publicly available exploit code, or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2019-09-08CPE matchmatch criteria
cpe:2.3:a:proofpoint:email_protection:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

3.7LOW

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.57%
Probability of exploitation in next 30 days
EPSS Percentile
72.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0158 is in the 61st percentile among its peer group of 1,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.3 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

atlas.mitre.org / studies/AML.CS0008
github.com / moohax/Proof-Pudding
Third Party Advisory
github.com / moohax/Talks/blob/master/slides/DerbyCon19.pdf
Third Party Advisory
proofpoint.com / us/security/CVE-2019-20634
Vendor Advisory
proofpoint.com / us/security/security-advisories/pfpt-sn-2020-0001
Vendor Advisory