opensmtpd: OpenSMTPD before 6.6.4 allows remote code execution because of anout-of-bounds read in mta_io in mta_session.c for mu...
CVE-2020-8794 is fixed in opensmtpd on 1 platform, first by opensmtpd 6.0.3p1-1ubuntu0.2, released February 25, 2020. It is not reported as exploited. Patch Radar priority: High.
OpenSMTPD before 6.6.4 allows remote code execution because of anout-of-bounds read in mta_io in mta_session.c for multi-line replies.Although this vulnerability affects the client side of OpenSMTPD, it ispossible to attack a server because the server code launches the clientcode during bounce handling.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| opensmtpd · Ubuntu 18.04.6 LTS (bionic) | 6.0.3p1-1ubuntu0.2 | opensmtpd 6.0.3p1-1ubuntu0.2 | Feb 25, 2020 |
| opensmtpd · Ubuntu 20.04 LTS (focal) | 6.6.4p1-1 | opensmtpd 6.6.4p1-1 | Feb 25, 2020 |
| opensmtpd · Ubuntu 24.10 (oracular) | 6.6.4p1-1 | opensmtpd 6.6.4p1-1 | Jan 16, 2026 |
| opensmtpd · Ubuntu 25.04 (plucky) | 6.6.4p1-1 | opensmtpd 6.6.4p1-1 | Jan 16, 2026 |
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