See: https://www.openssl.org/news/secadv/20200421.txt Recent versions of Buildroot use version 1.1.1f
Thanks, it's already fixed by https://git.buildroot.org/buildroot/commit/?id=849aee4f8805cce89376c0cd1ce23721436a90ac. As it is a security bump, it will be backported to our 2020.02.x LTS branch.