Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2020-7247

CVE-2020-7247CRITICAL

n/a n/a — OpenBSD OpenSMTPD

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  H  H  H    9.8   .9897   99.9   YES

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Jan 20  Reserved by mitre
  Jan 29  Published (CNA: mitre)
  Mar 25  Added to CISA KEV, remediation due 2022-04-15

CWE-755 · CNA: mitre · CVSS v3.1 · 15 references · KEV due April 15, 2022

Description

smtp_mailaddr in smtp_session.c in OpenSMTPD 6.6, as used in OpenBSD 6.6 and other products, allows remote attackers to execute arbitrary commands as root via a crafted SMTP session, as demonstrated by shell metacharacters in a MAIL FROM field. This affects the "uncommented" default configuration. The issue exists because of an incorrect return value upon failure of input validation.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
January 20, 2020	Reserved	Reserved by mitre
January 29, 2020	Published	Published (CNA: mitre)
March 25, 2022	KEV ADDED	Added to CISA KEV, remediation due 2022-04-15

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-755

References (15)

http://packetstormsecurity.com/files/156137/OpenBSD-OpenSMTPD-Privilege-Escalation-Code-Execution.html [x_refsource_MISC]
http://packetstormsecurity.com/files/156145/OpenSMTPD-6.6.2-Remote-Code-Execution.html [x_refsource_MISC]
http://packetstormsecurity.com/files/156249/OpenSMTPD-MAIL-FROM-Remote-Code-Execution.html [x_refsource_MISC]
http://packetstormsecurity.com/files/156295/OpenSMTPD-6.6.1-Local-Privilege-Escalation.html [x_refsource_MISC]
http://packetstormsecurity.com/files/162093/OpenBSD-OpenSMTPD-6.6-Remote-Code-Execution.html [x_refsource_MISC]
http://seclists.org/fulldisclosure/2020/Jan/49 [mailing-list, x_refsource_FULLDISC]
http://www.openwall.com/lists/oss-security/2020/01/28/3 [x_refsource_MISC]
https://github.com/openbsd/src/commit/9dcfda045474d8903224d175907bfc29761dcb45 [x_refsource_CONFIRM]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/ [vendor-advisory, x_refsource_FEDORA]
https://seclists.org/bugtraq/2020/Jan/51 [mailing-list, x_refsource_BUGTRAQ]
https://usn.ubuntu.com/4268-1/ [vendor-advisory, x_refsource_UBUNTU]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-7247 [government-resource]
https://www.debian.org/security/2020/dsa-4611 [vendor-advisory, x_refsource_DEBIAN]
https://www.kb.cert.org/vuls/id/390745 [third-party-advisory, x_refsource_CERT-VN]
https://www.openbsd.org/security.html [x_refsource_CONFIRM]

Authoritative record: CVE-2020-7247 at cve.org

Weaknesses: CWE-755

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-7247 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.