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ProFTPD CIDR Access Control Rule Bypass Vulnerability

ProFTPD is prone to a vulnerability that an attacker could exploit to bypass an Access Control List (ACL). The issue was reportedly introduced when a 'portability workaround' was applied to ProFTPD 1.2.9.

This vulnerability may lead a system administrator into a false sense of security, where access to the ProFTPD server is believed to be restricted by ACLs, but in reality the access restrictions will not be enforced at all.