ProFTPD 1.2.x, including 1.2.8 and 1.2.10, responds in a different amount of time when a given username exists, which allows remote attackers to identify valid usernames by timing the server response.
| Software | From | Fixed in |
|---|---|---|
| proftpd / proftpd | 1.2.0 | 1.2.10.x |