Older repositories contain exploits targeting hMailServer versions 4.x and early 5.x, where input validation on IMAP commands was insufficient.
: Scanning for open ports, identifying hMailServer on ports 25, 110, 143, 587, and 993
You will find "Proof of Concept" (PoC) scripts on GitHub that automate the creation of the malicious payload using tools like ysoserial.net Mitigation: Update to hMailServer version 5.7.3-B2646 2. CVE-2019-14238: Local Privilege Escalation (LPE)
If you are a system administrator, downloading an exploit from GitHub to test your own server is a valid security exercise. To do this safely: hmailserver exploit github
1. hMailServer Administrator Password Hash Disclosure (CVE-2019-12173)
Advanced attack chains combine multiple vulnerabilities. In documented penetration tests, after compromising hMailServer, attackers exploited CVE-2023-2255 in LibreOffice (installed on the same system) to achieve command execution. Malicious ODT files were generated using online PoC exploits and triggered when opened by scheduled tasks running as privileged users.
If you're running hMailServer, here are some steps to protect against this exploit: To do this safely: 1
This is one of the more recent and significant findings. It involves an Insecure Deserialization vulnerability.
Searching for "hmailserver exploit github" reveals several repositories and security advisories that provide Proof of Concept (PoC) tools and documentation for exploiting known vulnerabilities in hMailServer. These resources are primarily intended for security research and penetration testing.
Understanding what exists within these GitHub repositories is critical for system administrators aiming to secure their infrastructure. The Landscape of hMailServer Exploits on GitHub Malicious ODT files were generated using online PoC
: Another PoC implementation that assumes specific server configurations (including the absence of TLS authentication for convenience) and is intended strictly for educational purposes and lab environments
is a popular, free, open-source email server for Windows. For over a decade, system administrators have relied on it for its robustness and low cost of entry. However, like any software exposed to the internet (on ports 25, 110, 143, and 465), it has become a target for malicious actors.
If the hMailServer binaries or service folders are configured with write permissions for "Authenticated Users," a low-privileged user can replace a legitimate executable (like hMailServer.exe ) with a malicious payload.
). This allows attackers with access to configuration files to decrypt passwords for database connections and other configured servers. Sensitive Information Disclosure (CVE-2025-52372):