CVE-2020-7247
CriticalActively exploited (CISA KEV)
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.
SeverityCritical
CVSS9.8
Exploit probability—
Product
OpenBSD OpenSMTPD
PublishedJan 29, 2020
First seenJan 29, 2020
Added to KEVMar 25, 2022
Weakness typeCWE-755CWE-755
How to fix
CISA required action
Apply updates per vendor instructions.
CISA due date: Apr 15, 2022Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| openbsd opensmtpd | 6.6 | — |
| debian debian_linux | 9.0, 10.0 | — |
| fedoraproject fedora | 32 | — |
| canonical ubuntu_linux | 18.04, 19.10 | — |
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