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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.
Use CWE-204, Accellion vendor hub and Ftp Server product page to widen CVE-2016-9499 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2016-9500 for nearby disclosures in the same product family.