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CVE-2020-7247

OpenSMTPD Remote Code Execution Vulnerability

  • Critical 9.8
  • Exploited: added to CISA KEV 25 Mar 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.

Key facts

Published
29 Jan 2020
Last changed
21 Oct 2025
Assigned by
mitre
KEV added
25 Mar 2022
KEV fix due
15 Apr 2022
EPSS
98.972% likely to be exploited in the next 30 days, higher than 99.93% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.8CVSS 3.1, Criticalfrom CISA (ADP container)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What to do

  • Apply updates per vendor instructions.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
n/an/a
  • n/a (affected)

Timeline

  1. 29 Jan 2020 Published
  2. 25 Mar 2022 CVE-2020-7247 added to CISA KEV
  3. 25 Mar 2022 Added to the CISA KEV catalogue

Weakness

References