Exposure of Sensitive Information to an Unauthorized Actor
The POP3 server (EPSTPOP3S.EXE) 4.22 in E-Post Mail Server 4.10 allows remote attackers to obtain sensitive information via multiple crafted APOP commands for a known POP3 account, which displays the password in a POP3 error message.
CWE-200 - Information Exposure
An information exposure vulnerability is categorized as an information flow (IF) weakness, which can potentially allow unauthorized access to otherwise classified information in the application, such as confidential personal information (demographics, financials, health records, etc.), business secrets, and the application's internal environment.