Hmailserver Exploit - Github

Scripts on GitHub demonstrate how sending a crafted IMAP command with an excessively long string can overwrite the instruction pointer (EIP) register.

What (built-in Microsoft SQL Compact, external MSSQL, MySQL, or PostgreSQL) are you using to back the mail server? hmailserver exploit github

HMailServer is a free, open-source mail server software written in C++ and designed to be highly customizable. It supports various features such as SMTP, POP3, and IMAP protocols, making it a versatile email solution. The software has been widely used by individuals, small businesses, and organizations due to its flexibility and cost-effectiveness. Scripts on GitHub demonstrate how sending a crafted

These vulnerabilities present varying levels of risk. While the 2025 vulnerabilities are rated Medium severity, they provide actionable attack vectors that can lead to sensitive information disclosure and potential lateral movement within compromised networks. It supports various features such as SMTP, POP3,

Restrict SMTP/IMAP traffic through a secure reverse proxy, a Web Application Firewall (WAF), or an enterprise email security gateway that filters malicious command sequences and malformed TCP payloads before they reach the Windows server. Database Isolation

Several GitHub repositories provide PoC code for this vulnerability, each with slightly different approaches:

: If an attacker gains local user access or exploits a separate path-traversal flaw to read host files, they can extract hMailServer.ini and hMailAdmin.exe.config . By running a script matching the hardcoded key definitions, the attacker can decrypt the password to the primary admin console or database. 2. Local Information Disclosure and Path Traversal