How severe is CVE-2021-30047?

CVE-2021-30047 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-2021-30047 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-30047?

CVE-2021-30047 affects Vsftpd Project Vsftpd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-30047?

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-2021-30047 published?

CVE-2021-30047 was published on 2023-08-22 and last updated on 2026-06-17.

CVE-2021-30047

CVE-2021-30047 is a high-severity vulnerability in Vsftpd Project Vsftpd 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)
EPSS exploit prediction: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Vsftpd Project Vsftpd
Published: 2023-08-22
Last modified: 2026-06-17

Description

VSFTPD 3.0.3 allows attackers to cause a denial of service due to limited number of connections allowed.

Frequently asked questions

What is CVE-2021-30047?: VSFTPD 3.0.3 allows attackers to cause a denial of service due to limited number of connections allowed.
How severe is CVE-2021-30047?: CVE-2021-30047 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-2021-30047 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-30047?: CVE-2021-30047 affects Vsftpd Project Vsftpd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-30047?: 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-2021-30047 published?: CVE-2021-30047 was published on 2023-08-22 and last updated on 2026-06-17.

References

https://www.exploit-db.com/exploits/49719

Affected products (1)

cpe:2.3:a:vsftpd_project:vsftpd:3.0.3:*:*:*:*:*:*:*

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