CVE-2020-8793

MEDIUMNVD 4.74.7—Elevated

4.7

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.

CVSS v3: 4.7
EG Score: 4.7(medium)
EPSS: 74.1%
KEV: Not listed

Published

February 25, 2020

Last Modified

November 21, 2024

References (10)

cve@mitrehttp://seclists.org/fulldisclosure/2020/Feb/28
cve@mitrehttp://www.openwall.com/lists/oss-security/2020/02/24/4
cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/
cve@mitrehttps://usn.ubuntu.com/4294-1/
cve@mitrehttps://www.openbsd.org/security.html
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2020/Feb/28
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2020/02/24/4
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/
af854a3a-2127-422b-91ae-364da2661108https://usn.ubuntu.com/4294-1/
af854a3a-2127-422b-91ae-364da2661108https://www.openbsd.org/security.html

Patch Availability(2)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	opensmtpd (6.0.3p1-6ubuntu0.2) @ eoan	2026-05-27	ubuntu
ubuntu	opensmtpd (5.7.3p2-1ubuntu0.1~esm2) @ xenial	2026-05-27	ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 10× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 07:17 UTCEG score recompute
2026-05-27 07:17 UTCVendor advisory
2026-05-27 07:17 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 04:16 UTCOSV refresh

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-48139
First seen Feb 26, 2020
OpenSMTPD 6.6.3 - Arbitrary File Read
Open source ↗

Frequently asked(5)

What is CVE-2020-8793?

CVE-2020-8793 is a medium vulnerability published on February 25, 2020. 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.

When was CVE-2020-8793 disclosed?

CVE-2020-8793 was first published in the National Vulnerability Database on February 25, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-8793 actively exploited?

CVE-2020-8793 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 74.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-8793?

CVE-2020-8793 has a CVSS v3 base score of 4.7 (NVD).

How do I remediate CVE-2020-8793?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-8793, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2020-8793

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CVE-2020-8793

Published

Last Modified

References (10)

Patch Availability(2)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Publicly available exploits

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-8793?

Same vendor

Same CWE

CVE-2020-8793

📅 Published

🔄 Last Modified

🔗 References (10)

Patch Availability(2)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-8793?

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References (10)

Frequently asked(5)

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