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Vulnerability record · CVE-2021-30047 · published 22 August 2023

CVE-2021-30047: Vsftpd project vsftpd vulnerability

VVsftpd Project · Vsftpd

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

7.5 CVSS 3.1 High EPSS 3.2% · top 12.3%
7.5CVSS 3.1 base score
3.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.exploit-db.com/exploits/49719 ExploitThird Party AdvisoryVDB Entry
https://www.exploit-db.com/exploits/49719 ExploitThird Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2011-2523vsftpd 2.3.4 tainted build ships remote root backdoor shellThe vsftpd 2.3.4 source downloaded between 20110630 and 20110703 was modified to include a backdoor that opens a shell on port 6200/tcp. Any host run…EPSS 96%analysed7.4CVE-2021-3618F5 nginx improper certificate validation vulnerabilityALPACA is an application layer protocol content confusion attack, exploiting TLS servers implementing different protocols but using compatible certif…EPSS 2.0%5.0CVE-2015-1419Opensuse vulnerabilityUnspecified vulnerability in vsftpd 3.0.2 and earlier allows remote attackers to bypass access restrictions via unknown vectors, related to deny_file…EPSS 6.8%4.0CVE-2011-0762vsftpd glob filter flaw enables authenticated denial of serviceThe vsf_filename_passes_filter function in ls.c in vsftpd before 2.3.3 mishandles crafted glob expressions in STAT commands. A remote authenticated u…EPSS 74%analysed

Source: NIST National Vulnerability Database (record CVE-2021-30047), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.