Accellion FTP server prior to version FTA_9_12_220 only returns the username in the server response if the username is invalid. An attacker may use this information to determine valid user accounts and enumerate them.
[
{
"product": "FTP Server",
"vendor": "Accellion",
"versions": [
{
"lessThan": " FTA_9_12_220",
"status": "affected",
"version": " FTA_9_12_220",
"versionType": "custom"
}
]
}
]