CWD ~root command in ftpd allows root access.
http://www.alw.nih.gov/Security/Docs/admin-guide-to-cracking.101.html
Source: Mitre, NVD
Published: 1988-11-11
Updated: 2008-09-09
Base Score: 10
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
Severity: Critical
Base Score: 9.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H