Security Advisory

CVE-2021-47865

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-01-21 17:27:44

Last updated 2026-04-07 14:06:22

Assigner VulnCheck

State PUBLISHED

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.

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