CVE-2020-8794

CRITICAL 9.8CVE-2020-8794 · Published 25/02/2020 · updated 17/06/2026

Package	Affected versions	Patched versions
opensmtpd opensmtpd	`< 6.6.4`	`6.6.4`

Description

OpenSMTPD before 6.6.4 allows remote code execution because of an out-of-bounds read in mta_io in mta_session.c for multi-line replies. Although this vulnerability affects the client side of OpenSMTPD, it is possible to attack a server because the server code launches the client code during bounce handling.

References

packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-Privilege-Escalation.html · Exploit
seclists.org/fulldisclosure/2020/Feb/32 · Mailing List
openwall.com/lists/oss-security/2020/02/26/1 · Exploit
openwall.com/lists/oss-security/2020/03/01/1 · Mailing List
openwall.com/lists/oss-security/2020/03/01/2 · Mailing List
openwall.com/lists/oss-security/2021/05/04/7 · Exploit
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E
usn.ubuntu.com/4294-1 · Patch
debian.org/security/2020/dsa-4634 · Third Party Advisory
openbsd.org/security.html · Third Party Advisory
openwall.com/lists/oss-security/2020/02/24/5 · Exploit

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