CVE catalog
CVE-2020-8794
opensmtpd: CVE-2020-8794
- Severity
- Medium
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 88.90% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | opensmtpd | sid | 7.9.0p0-1 | fixed |
| Debian | opensmtpd | forky | 7.9.0p0-1 | fixed |
| Debian | opensmtpd | trixie | 7.6.0p1-1 | fixed |
| Debian | opensmtpd | bookworm | 6.8.0p2-4 | fixed |
| Ubuntu | opensmtpd | pro | 5.4.2p1-4 | vulnerable |
| Ubuntu | opensmtpd | pro | 5.7.3p1-1 | vulnerable |
| Ubuntu | opensmtpd | pro | 5.7.3p2-1 | vulnerable |
| Ubuntu | opensmtpd | pro | 5.7.3p2-1ubuntu0.1~esm1 | vulnerable |
| Ubuntu | opensmtpd | pro | 5.7.3p2-1ubuntu0.1~esm2 | fixed |
| Ubuntu | opensmtpd | 18.04 | 6.0.2p1-2build1 | vulnerable |
| Ubuntu | opensmtpd | 18.04 | 6.0.3p1-1 | vulnerable |
| Ubuntu | opensmtpd | 18.04 | 6.0.3p1-1build1 | vulnerable |
| Ubuntu | opensmtpd | 18.04 | 6.0.3p1-1ubuntu0.1 | vulnerable |
| Ubuntu | opensmtpd | 18.04 | 6.0.3p1-1ubuntu0.2 | fixed |
| Ubuntu | opensmtpd | 20.04 | 6.0.3p1-6 | vulnerable |
| Ubuntu | opensmtpd | 20.04 | 6.0.3p1-6build1 | vulnerable |
| Ubuntu | opensmtpd | 20.04 | 6.6.1p1-1 | vulnerable |
| Ubuntu | opensmtpd | 20.04 | 6.6.1p1-3 | vulnerable |
| Ubuntu | opensmtpd | 20.04 | 6.6.1p1-4 | vulnerable |
| Ubuntu | opensmtpd | 20.04 | 6.6.1p1-5 | vulnerable |
| Ubuntu | opensmtpd | 20.04 | 6.6.2p1-1 | vulnerable |
| Ubuntu | opensmtpd | 20.04 | 6.6.4p1-1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | opensmtpd | source | sid | 6.6.4p1-1 | not yet assigned | Not reported | [952453] |
| Debian | opensmtpd | source | forky | 6.6.4p1-1 | not yet assigned | Not reported | [952453] |
| Debian | opensmtpd | source | trixie | 6.6.4p1-1 | not yet assigned | Not reported | [952453] |
| Debian | opensmtpd | source | bookworm | 6.6.4p1-1 | not yet assigned | Not reported | [952453] |
| Ubuntu | opensmtpd | deb | pro | 5.7.3p2-1ubuntu0.1~esm2 | Not reported | UBUNTU-CVE-2020-8794 | Not reported |
| Ubuntu | opensmtpd | deb | 18.04 | 6.0.3p1-1ubuntu0.2 | Not reported | UBUNTU-CVE-2020-8794 | Not reported |
| Ubuntu | opensmtpd | deb | 20.04 | 6.6.4p1-1 | Not reported | UBUNTU-CVE-2020-8794 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [opensmtpd]Fixed
Details (4)
6.8.0p2-4+b4· amd64 · bookwormFixed · Fixed:
6.6.4p1-1dsa · opensmtpd · debian · bookworm; dsa · opensmtpd · debian · 12
6.8.0p2-4+b4· arm64 · bookwormFixed · Fixed:
6.6.4p1-1dsa · opensmtpd · debian · bookworm; dsa · opensmtpd · debian · 12
7.4.0p1-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
6.6.4p1-1dsa · opensmtpd · debian · bookworm; dsa · opensmtpd · debian · 12
7.4.0p1-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
6.6.4p1-1dsa · opensmtpd · debian · bookworm; dsa · opensmtpd · debian · 12
[Debian 13 (Trixie)]
- [opensmtpd]Fixed
Details (2)
7.6.0p1-1· amd64 · trixieFixed · Fixed:
6.6.4p1-1dsa · opensmtpd · debian · 13
7.6.0p1-1· arm64 · trixieFixed · Fixed:
6.6.4p1-1dsa · opensmtpd · debian · 13
Observed: