Original sentence: Heartbleed, an OpenSSL vulnerability introduced in 2012 and disclosed in April 2014, removed confidentiality from affected services, causing among other things the shut down of the Canada Revenue Agency's public access to the online filing portion of its website
Edited sentence: Heartbleed, a catastrophic OpenSSL vulnerability introduced in 2012 and disclosed on 2014-04-07, removed confidentiality from affected services, causing among other things the shut down of the Canada Revenue Agency's public access to the online filing portion of its website