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CVE-2021-30047

30
FAUCET Score

CVE-2021-30047 describes a denial-of-service vulnerability in VSFTPD 3.0.3, allowing attackers to exhaust the limited number of allowed connections. This vulnerability is rated as high severity (CVSS 7.5), requiring no authentication or user interaction, and can be exploited remotely to cause a complete denial of service. While there is no evidence of active exploitation or Metasploit modules, a Nuclei template exists for detection, and there is minimal community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.0.3CPE matchmatch criteria
cpe:2.3:a:vsftpd_project:vsftpd:3.0.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.07%
Probability of exploitation in next 30 days
EPSS Percentile
86.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Nuclei: CVE-2021-30047 · Oct 2, 2025
This CVE's current EPSS score of 0.0307 is in the 75th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (2)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: vsftpd
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: vsftpd

Vendor Advisories (1)

redhatCVE-2021-30047Moderate

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

Aug 22, 2023

References

exploit-db.com / exploits/49719
ExploitThird Party AdvisoryVDB Entry