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[ CVE-2020-7247 · Published 29 Jan 2020 ]

OpenSMTPD Remote Code Execution Vulnerability

Exploited · CISA KEV CVSS 9.8 EPSS 99%Fix available

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-03-25
  • EPSS: 99% chance of exploitation in the next 30 days (higher than 100% of CVEs)
  • Critical severity: CVSS 9.8

[ Description ]Official 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.

CISA: smtp_mailaddr in smtp_session.c in OpenSMTPD, as used in OpenBSD and other products, allows remote attackers to execute arbitrary commands as root via a crafted SMTP session.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 15 Apr 2022): Apply updates per vendor instructions.

[ References ]References