wa.exe is the web interface for LISTSERV on Windows: https://www.lsoft.com/manuals/16.0/htmlhelp/list%20subscribers/IntrototheWebInterface.html https://www.lsof

wa.exe is the web interface for LISTSERV on Windows: https://www.lsoft.com/manuals/16.0/htmlhelp/list%20subscribers/IntrototheWebInterface.html https://www.lsoft.com/manuals/16.0/htmlhelp/list%20subscribe... AFAICT this mailing-list post is the original public announcement, but perhaps the submitter followed up with the Schneier link in anticipation of concerns like yours.