5.3.0 is being shipped
Found this note from Hik
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Optimize and upgrade firmware to enhance security features:
1. IPC
a) In March 2015, the company plans to release IPC version 5.3.0. The
update will include the following security enhancements:
>> If the default password is not changed, a change the password prompt will
show up when a customers attempted to log-in.
>> Telnet access is no longer available. A SecureCRT SSH client is provided
which can be enabled to provide a secure telnet interface.
>> IPC will lock the current login IP address after 5 incorrect login attempts.
>> When the user resets the password, a password strength prompt
(high, middle, low) will show in the web browser.
>> In SSH login status, parameters of IPC can only be checked, but not changed.
To change the parameters in SSH interface, a dynamic password is required and
must be requested from the Hikvision R&D team