CVE-2020-8793

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-02-25 · updated 2026-06-17
Weakness: CWE-367

Description

OpenSMTPD before 6.6.4 allows local users to read arbitrary files (e.g., on some Linux distributions) because of a combination of an untrusted search path in makemap.c and race conditions in the offline functionality in smtpd.c.

Affected products

Canonical Ubuntu Linux: 18.04, 19.10
Fedoraproject Fedora: 32
Opensmtpd: before 6.6.4 — fixed in 6.6.4

How to fix

Upgrade to a fixed version: Opensmtpd 6.6.4. Check the vendor advisory for mitigations.

References

http://seclists.org/fulldisclosure/2020/Feb/28
http://www.openwall.com/lists/oss-security/2020/02/24/4
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/
https://usn.ubuntu.com/4294-1/
https://www.openbsd.org/security.html
http://seclists.org/fulldisclosure/2020/Feb/28
http://www.openwall.com/lists/oss-security/2020/02/24/4
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/
https://usn.ubuntu.com/4294-1/
https://www.openbsd.org/security.html

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