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.
Metrics
CVSS 3.1 9.8/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a | n/a |
References
- http://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-Privilege-Escalation.htmlExploit, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2020/Feb/32Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/02/26/1Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/03/01/1Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/03/01/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/04/7Exploit, Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/
- https://usn.ubuntu.com/4294-1/Patch, Third Party Advisory
- https://www.debian.org/security/2020/dsa-4634Third Party Advisory
- https://www.openbsd.org/security.htmlThird Party Advisory
- https://www.openwall.com/lists/oss-security/2020/02/24/5Exploit, Mailing List, Third Party Advisory
- http://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-Privilege-Escalation.htmlExploit, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2020/Feb/32Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/02/26/1Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/03/01/1Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/03/01/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/04/7Exploit, Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/
- https://usn.ubuntu.com/4294-1/Patch, Third Party Advisory
- https://www.debian.org/security/2020/dsa-4634Third Party Advisory
- https://www.openbsd.org/security.htmlThird Party Advisory
- https://www.openwall.com/lists/oss-security/2020/02/24/5Exploit, Mailing List, Third Party Advisory
Timeline
- Published
- Feb 25, 2020
- Last modified
- Jun 17, 2026
- NVD status
- Modified