In the given list of GNU CVEs in the original article, it included a buffer overrun in tail from 2021. So for a fair comparison 2021 is part of the "window of a

In the given list of GNU CVEs in the original article, it included a buffer overrun in tail from 2021. So for a fair comparison 2021 is part of the "window of activity" (the year uu_od CVE was published).