Joomla 2.5.28 was released just before Christmas 2014, and the couple of sites we had left on this "old" Joomla! platform was updated accordingly within a couple of days of this release.
This release also marked the end of Joomla 2.5, as this was the final scheduled release for the series. "End of support" refers to when Joomla! no longer provides bug fixes, features, or security updates for a release.
We today experienced an attempt to hack on one of our hosting servers.
The attack was ongoing for about half an hour and ended at 1335 when we blocked the offending IP address.
Our security software and routines detect these kind of attempts every day, but todays attempt was more of an annoyance to us as the massive traffic generated by the offending IP address took up a lot of the available resources on the server. The websites hosted on this server would therefore have appeared quite slow for the time this was ongoing.