CVE-2020-8794
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.
Official description from the CVE record, published by mitre. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org
Key data
EPSS
Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
- Score
- 0.88900 (88.9% probability)
- Percentile
- 99.8%
- Scores of
- Nov 10, 2026
- Model
- v2026.06.15
References
Links listed in the CVE record. They lead to other sites, which CubePath does not control.
- openbsd.org/security.html
- openwall.com/lists/oss-security/2020/02/24/5
- [oss-security] 20200226 Re: LPE and RCE in OpenSMTPD's default install (CVE-2020-8794) (openwall.com)mailing-list
- DSA-4634 (debian.org)vendor-advisory
- 20200227 LPE and RCE in OpenSMTPD's default install (CVE-2020-8794) (seclists.org)mailing-list
- [oss-security] 20200301 Re: LPE and RCE in OpenSMTPD's default install (CVE-2020-8794) (openwall.com)mailing-list
- [oss-security] 20200301 Re: LPE and RCE in OpenSMTPD's default install (CVE-2020-8794) (openwall.com)mailing-list
- packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bound…
- FEDORA-2020-b92d7083ca (lists.fedoraproject.org)vendor-advisory
- USN-4294-1 (usn.ubuntu.com)vendor-advisory
- [oss-security] 20210504 21Nails: Multiple vulnerabilities in Exim (openwall.com)mailing-list
Timeline
- ID reserved
- Record published
- Record last updated
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About CubePath
CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.
Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:51 UTC. Sources and licenses