Openbsd Opensmtpd vulnerabilities

CVE-2020-7247 [CRITICAL] CWE-78 CVE-2020-7247: smtp_mailaddr in smtp_session.c in OpenSMTPD 6.6, as used in OpenBSD 6.6 and other products, allows smtp_mailaddr in smtp_session.c in OpenSMTPD 6.6, as used in OpenBSD 6.6 and other products, allows remote attackers to execute arbitrary commands as root via a crafted SMTP session, as demonstrated by shell metacharacters in a MAIL FROM field. This affects the "uncommented" default configuration. The issue exists because of an incorrect return value

CVE-2015-7687 [CRITICAL] CWE-416 CVE-2015-7687: Use-after-free vulnerability in OpenSMTPD before 5.7.2 allows remote attackers to cause a denial of Use-after-free vulnerability in OpenSMTPD before 5.7.2 allows remote attackers to cause a denial of service (crash) or execute arbitrary code via vectors involving req_ca_vrfy_smtp and req_ca_vrfy_mta.

CVE-2013-2125 [MEDIUM] CWE-310 CVE-2013-2125: OpenSMTPD before 5.3.2 does not properly handle SSL sessions, which allows remote attackers to cause OpenSMTPD before 5.3.2 does not properly handle SSL sessions, which allows remote attackers to cause a denial of service (connection blocking) by keeping a connection open.