How severe is CVE-2021-39304?

CVE-2021-39304 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-39304 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39304?

CVE-2021-39304 affects Proofpoint Enterprise Protection. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-39304?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-39304 published?

CVE-2021-39304 was published on 2021-10-13 and last updated on 2026-06-17.

CVE-2021-39304

CVE-2021-39304 is a high-severity vulnerability in Proofpoint Enterprise Protection with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Proofpoint Enterprise Protection
Published: 2021-10-13
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2021-39304?: Proofpoint Enterprise Protection before 8.12.0-2108090000 allows security control bypass.
How severe is CVE-2021-39304?: CVE-2021-39304 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-39304 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39304?: CVE-2021-39304 affects Proofpoint Enterprise Protection. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-39304?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-39304 published?: CVE-2021-39304 was published on 2021-10-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:proofpoint:enterprise_protection:*:*:*:*:*:*:*:*

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