What is the severity of CVE-2021-30047?

CVE-2021-30047 has a CVSS Base Score of 7.5/10 and is classified as High severity. It is important to assess the risk based on your specific environment.

How do I fix CVE-2021-30047?

Remediation typically involves updating the affected software products to the latest patched version. Refer to the 'Affected Products' and 'Remediation' sections on this page for specific mitigation steps and vendor advisories.

Home→Vulnerabilities→CVE-2021-30047

Disclosed

CVE-2021-30047

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

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Public Exploit Available

A Proof-of-Concept (PoC) or exploit code for this vulnerability is publicly available. This significantly increases the risk of exploitation.

Exploitation Probability (EPSS)

Medium Priority

31.26%

The Exploit Prediction Scoring System (EPSS) uses machine learning to estimate the probability that a vulnerability will be exploited in the wild within the next 30 days.

0% (Theoretical)100% (Certainty)

7-Day Exploitation Trend

Vulnerability Timeline

3 events

Aug 22, 2023

Vulnerability Disclosed

Published to component-level vulnerability database.

Aug 25, 2023

Last Updated

Record updated with new analysis or tags.

Oct 9, 2025

EPSS Score Increased

Daily EPSS score increased by 0.311 on 2023-12-30

Threat Actor Attribution

PREMIUM INTEL

Associated Groups:Lazarus Group, APT28

Ransomware Campaigns:LockBit 3.0, BlackCat

IoCs (Indicators):14 IPs, 3 Hashes

Remediation & Mitigation

SOLUTION

Official patches and mitigation steps are available for this vulnerability.

# Update Command
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name

Affected Products

1 Total

vsftpd_project/vsftpd3.0.3

References

PoC Exploit

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

ExploitThird Party AdvisoryVDB Entry

Am I Vulnerable?

Check your domain or package.json for CVE-2021-30047 exposure.

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Vulnerability Details

CVSS Base Score

7.5/ 10

Vector

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

Published Date

Aug 22, 2023

Last Modified

Aug 25, 2023

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