CVE-2020-8794
CRITICAL9.8EPSS 88.1%opensmtpd - security update
Published: 2/25/2020Modified: 4/28/2026
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.
Affected packages (2)
- Debian/opensmtpdfrom 0, < 6.6.4p1-1
- Debian/opensmtpdfrom 0, < 6.0.2p1-2+deb9u3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |