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Fencer Vulns
medium 4.7

CVE-2020-8793 json

OpenSMTPD before 6.6.4 allows local users to read arbitrary files (e.g., on some Linux distributions) because of a combination of an untrus…

published 2020-02-25 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-29641

cvss
4.7
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 58%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

  • opensmtpd opensmtpd 6.6.4
  • opensmtpd Debian 14, Debian 13, Debian 12 6.6.4p1-1

debian advisories DEBIAN-CVE-2020-8793

  • opensmtpd Ubuntu 18.04 LTS 6.0.3p1-1ubuntu0.2
  • opensmtpd Ubuntu 20.04 LTS 6.6.4p1-1
  • opensmtpd Ubuntu Pro 16.04 LTS 5.7.3p2-1ubuntu0.1~esm2

ubuntu advisories UBUNTU-CVE-2020-8793

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-8793 updated cvss 7.8

opensmtpd: Reading of arbitrary file by unprivileged attacker can result in information disclosure or privilege escalation

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. Published
  2. First public exploit (EDB-48139)

Exploit prediction

0.87% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-48139 OpenSMTPD 6.6.3 - Arbitrary File Read remote, 2020-02-26
  • openwall.com http://www.openwall.com/lists/oss-security/2020/02/24/4 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 4.7 AV:L/AC:M/Au:N/C:C/I:N/A:N

Classification

Weakness
  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
  • CWE-426 Untrusted Search Path

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.