An insecure deserialization operation in the Trend Micro Endpoint Encryption PolicyServer could lead to a post-authentication remote code execution on affected installations.
Please note: an attacker must first obtain the ability to execute low-privileged code on the target system to exploit this vulnerability.
The code uses deprecated or obsolete functions, which suggests that the code has not been actively reviewed or maintained.
As programming languages evolve, functions occasionally become obsolete due to:
Functions that are removed are usually replaced by newer counterparts that perform the same task in some different and hopefully improved way.