make_ftp_cmd in main.c in ProFTPD before 1.3.8a has a one-byte out-of-bounds read, and daemon crash, because of mishandling of quote/backslash semantics.
1.3.5-21.3.5a-11.3.5a-1build11.3.5a-1ubuntu0.11.3.5d-11.3.5e-1build11.3.6-6build21.3.6c-11.3.6c-21.3.6c-2ubuntu0.11.3.7b+dfsg-11.3.7c+dfsg-1build11.3.7c+dfsg-1ubuntu0.11.3.8+dfsg-81.3.8.a+dfsg-11.3.8.b+dfsg-1Exploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:NI:NA:HCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H