Source: swftools Severity: serious swftools is orphaned for a year, dead upstream and has frequent security issues. Also, Flash is a thing of the past, so let's drop it from buster (initially filing this bug to out it out of testing, will also sort out the removal, which will take longer).
One one rev dep is left in testing (jquery-jplayer), I'll file a separate bug against it. Cheers, Moritz