Using bird 1.x

Hello, I am researching BIRD 1.x for my computer science security in an open-source project and I noticed that its last update was in late 2019. I want to understand it from a maintenance perspective and I would like to know if security bugs found in 2.x will be looked into for 1.x and backported to the 1.x branch. Sorry if this has already been asked, I read through some FAQs and search past messages, but if I missed something please point me to it. Thanks, Peter M