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Public proof of concept

CVE-2021-30047

A public proof of concept exists; no exploitation attested.

  • Published2023-08-22

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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

Timeline

dates in UTC
  1. 2023-08-2219:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-30047?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-30047?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Vsftpd project vsftpd
BranchAffectedFixed in
3.0= 3.0.3no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2021-30047 Red Hat Product Security4 known affected

    vsftpd: denial of service due to limited number of connections allowed

    vsftpd as a component of Red Hat Enterprise Linux 6 · vsftpd.src as a component of Red Hat Enterprise Linux 6 · vsftpd-sysvinit as a component of Red Hat Enterprise Linux 7 · +1 more

Full record on NVD

Fix

  1. No fix planned, says the vendor Red Hat Product Security CVE-2021-30047 · 4 productsOut of support scope

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2023-08-22
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-p8mp-mm84-7pqr

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.

Is CVE-2021-30047 actively exploited?

A proof-of-concept exploit exists for CVE-2021-30047, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2021-30047?

CVE-2021-30047 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

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Sources for this record