CVE-2020-7247
CRITICALEPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
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.
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
OpenSMTPD 6.4.0 < 6.6.1 - Local Privilege Escalation + Remote Code Execution
by Marco Ivaldi · Feb 11, 2020
OpenSMTPD - MAIL FROM Remote Code Execution (Metasploit)
by Metasploit · Feb 10, 2020
OpenSMTPD 6.6.1 - Remote Code Execution
by 1F98D · Jan 30, 2020
Frequently Asked Questions
Is CVE-2020-7247 in your stack?
O3 detects CVE-2020-7247 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.