CVE-2020-7247: in the CISA KEV catalogue
OpenSMTPD Remote Code Execution Vulnerability. CISA added CVE-2020-7247 to the Known Exploited Vulnerabilities catalogue on 2022-03-25 with a default due date of 2022-04-15. Known ransomware campaign use: Unknown. Forensic triage flag: No.
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. (CISA description)
- Vendor / product
- OpenBSD OpenSMTPD
- CWE
- CWE-755, CWE-78
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 99%, percentile 99 (scored 2026-11-03)
EPSS puts about 99 in 100 odds (99%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2020-7247 in the CISA KEV catalogue?
Yes. CISA added CVE-2020-7247 (OpenSMTPD Remote Code Execution Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2022-03-25. CISA's default due date for it is 2022-04-15.
Is CVE-2020-7247 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2020-7247. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2020-7247?
CISA's required action: Apply updates per vendor instructions.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2020-7247