nut -- upsd can be remotely crashed

Networkupstools project reports:

NUT server (upsd), from versions 2.4.0 to 2.6.3, are exposed to
crashes when receiving random data from the network.
This issue is related to the way NUT parses characters, especially
from the network. Non printable characters were missed from strings
operation (such as strlen), but still copied to the buffer, causing
an overflow.