How severe is CVE-2021-39304?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Proofpoint Enterprise Protection

CVE-2021-39304

Proofpoint Enterprise Protection before 8.12.0-2108090000 allows security control bypass.

Published 2021-10-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.010 (61.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Proofpoint Enterprise Protection

References

www.proofpoint.com/us/blog (Vendor Advisory)
www.proofpoint.com/us/security/security-advisories/pfpt-sa-2021-0007 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-39304?: CVE-2021-39304 is a high-severity vulnerability in Proofpoint Enterprise Protection. CVSS score: 7.5/10. Published 2021-10-13.
How severe is CVE-2021-39304?: High severity. CVSS v3 base score is 7.5 out of 10.