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.
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 23 Jan 2026 19:30:00 +0000

Type Values Removed Values Added
References

Fri, 23 Jan 2026 19:15:00 +0000

Type Values Removed Values Added
References

Fri, 23 Jan 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Proftpd
Proftpd proftpd
Vendors & Products Proftpd
Proftpd proftpd

Thu, 22 Jan 2026 23:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 21 Jan 2026 17:45:00 +0000

Type Values Removed Values Added
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.
Title ProFTPD 1.3.7a - Remote Denial of Service
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-01-23T18:57:32.039Z

Reserved: 2026-01-18T12:35:05.170Z

Link: CVE-2021-47865

cve-icon Vulnrichment

Updated: 2026-01-22T21:57:52.914Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-01-21T18:16:18.470

Modified: 2026-01-26T15:04:59.737

Link: CVE-2021-47865

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-01-22T10:15:06Z

Weaknesses