Exim 4 before 4.94.2 has Improper Neutralization of Line Delimiters. An authenticated remote SMTP client can insert newline characters into a spool file (which indirectly leads to remote code execution as root) via AUTH= in a MAIL FROM command.
"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2020-28021.json"