CVE-2010-20103

Critical

Description

A malicious backdoor was embedded in the official ProFTPD 1.3.3c source tarball distributed between November 28 and December 2, 2010. The backdoor implements a hidden FTP command trigger that, when invoked, causes the server to execute arbitrary shell commands with root privileges. This allows remote, unauthenticated attackers to run any OS command on the FTP server host.

SeverityCritical

CVSS9.8

Exploit probability—

ProductProftpd

PublishedAug 20, 2025

First seenAug 20, 2025

Weakness typeCWE-912CWE-912

How to fix

Patches

web.archive.org/web/20111107212129/http://rsync.proftpd.org/

Affected products

Product	Affected versions	Fixed in
proftpd proftpd	1.3.3	—

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