Multiple buffer overflows in Cyrus Sieve / libSieve 2.1.2 and earlier allow remote attackers to execute arbitrary code via (1) a long header name, (2) a long IMAP flag, or (3) a script that generates a large number of errors that overflow the resulting error string.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.144
EPSS Ranking 94.1%