Vulnerability Intelligence Report
OpenSMTPD Remote Code Execution Vulnerability
CVE-2020-7247
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 KEV
Nuclei Template
SSVC: Active Exploitation
Automatable
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
EPSS Probability:98.97%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-755 ↗CWE-755 Improper Handling of Exceptional Conditions
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| openbsd | opensmtpd | 6.6 |
| debian | debian_linux | 9.0, 10.0 |
| fedoraproject | fedora | 32 |
| canonical | ubuntu_linux | 18.04, 19.10 |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
CISA KEV
ACTIVE IN CATALOG
Nuclei Template
SCANNER AVAILABLE
EPSS Score
98.972%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | MITRE Corporation · N/A · USA |
| Reserved | 2020-01-20T00:00:00 |
| Published | 2020-01-29T15:53:18 |
| Last Updated | 2025-10-21T23:35:53 |
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