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CVE

CWE

Training

CVE-2021-47865

Published: Jan 21, 2026

Modified: Apr 7, 2026

PUBLISHED

CVSS v3.1

7.5

HIGH

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.

Vendor	Product	Versions
ProFTPD	ProFTPD	affected `1.3.7a`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

None

Integrity

None

Availability

High

References

ExploitDB-49697

exploit

ProFTPD Official Website

product

ProFTPD GitHub Repository

issue-tracking

VulnCheck Advisory: ProFTPD 1.3.7a - Remote Denial of Service

third-party-advisory

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