Buffer overflow in (1) lprintf and (2) cprintf in sysdep.c of Citadel/UX 5.90 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via attacks such as a long HELO command to the SMTP server.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.038
EPSS Ranking 87.5%