Vulnerabilidad · Publicado 08/10/2026
Vulnerabilidad alta en Progressive Robot hMailServer permite a usuarios locales sin credenciales ejecutar desbordamiento de búfer en memoria heap mediante la rutina DecryptFromString, afectando servidores de correo en Windows. El proceso del servicio ejecuta con privilegios LocalSystem, permitiendo escritura de bytes arbitrarios con potencial acceso a datos sensibles y ejecución de código. Impacta infraestructuras de correo empresarial en México y LATAM que mantienen versiones 6.0.0 a 6.3.3.
Heap-based buffer overflow in the legacy Blowfish decryption routine (BlowFishEncryptor::DecryptFromString) in Progressive Robot hMailServer 6.0.0 through 6.3.3 on Windows allows a local interactive user with no hMailServer credentials to write bytes of their choosing past the end of a 255-byte heap buffer in the hMailServer service process, which runs as LocalSystem by default. The user does this by passing a long hexadecimal string to the COM method Utilities.BlowfishDecrypt, which checked no authentication. The routine converted hexadecimal input of any length into a fixed 255-byte buffer before decrypting it in place. The result is a denial of service (service crash), and possibly code execution with the privileges of the service account.
Score: 7.8/10 — Severidad: HIGH — Estado NIST: Received
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-122
Publicado en NIST NVD.