This indicates a possible attempt to exploit a buffer overrun vulnerability in the BVRP SLMail server software.
SLMail Pro is a web-based POP3 and SMTP email server for Microsoft Windows NT/2000/2003. The vulnerability occurs in the POP3 server and is caused by insufficient bounds checking of the user-supplied password during authentication. A remote attacker can cause a buffer overflow by sending a password of more than 2600 bytes length, and as a result may be able to execute arbitrary code on the system.
BVRP Software SLMail 18.104.22.16820 and earlier.
System compromise, arbitrary code execution.
Upgrade to BVRP Software SLMail 5.5 or later.