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CVE-2021-47865 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

ProFTPD 1.3.7a contains a denial of service vulnerability that allows attackers to overwhelm the server by creating multiple simultaneous FTP connections. Attackers can repeatedly establish connections using threading to exhaust server connection limits and block legitimate user access.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/proftpd/proftpd/issues/1298	[email protected]
https://www.exploit-db.com/exploits/49697	[email protected]	Exploit
https://www.vulncheck.com/advisories/proftpd-a-remote-denial-of-service	[email protected]	AdvisoryBroken Link
http://www.proftpd.org/	[email protected]	Vendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-770	Allocation of Resources Without Limits or Throttling	[email protected]

Affected Products

Product	Versions
ProFTPD	1.3.7a
CPE cpe:2.3:a:proftpd:proftpd:::::::: Remediation Upgrade: 1.3.9moderate efforthttp://www.proftpd.org/ Upgrade: 1.3.8dmoderate efforthttp://www.proftpd.org/

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Jan 23, 2026	CVE Modified	[email protected]
Jan 21, 2026	New CVE Received	[email protected]