Our current appliances (v14.2) are based on Debian Jessie so they include the versions supplied with that. You can check Debian packages via the Debian package search.

FWIW, we also publish a "manifest" file for each appliance. That provides the explicit versions for each piece of software included in the ISO/build. You can find that on each appliance page (e.g. lamp appliance) via a link which says "Manifest & Sigs". Once you've clicked on that link, look for the manifest file. Here is LAMP's. From that you can see:

[...]
apache2 2.4.10-10+deb8u8
[...]
mysql-server 5.5.54-0+deb8u1
[...]
php5-common 5.6.30+dfsg-0+deb8u1
[...]

I'm not really sure why you got that error though?! I double checked and couldn't reproduce it. However, that's hosted on our mirror, so it's likely that I was viewing a completely different server than you.