# CVE-2020-7247: opensmtpd: smtp_mailaddr in smtp_session.c in OpenSMTPD 6.6, as used in OpenBSD 6.6 and other products, allows remote attackers...

CVE-2020-7247 is fixed in opensmtpd on 1 platform by opensmtpd 6.0.3p1-1ubuntu0.1 (version 6.0.3p1-1ubuntu0.1), released January 29, 2020. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on March 25, 2022. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/cve/CVE-2020-7247
- Priority: Patch now
- CVSS: n/a (High)
- EPSS: 0.9897
- CISA KEV: listed Mar 25, 2022, federal due date Apr 15, 2022
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 29, 2020

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | opensmtpd Ubuntu 18.04.6 LTS (bionic) | 6.0.3p1-1ubuntu0.1 | [opensmtpd 6.0.3p1-1ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-opensmtpd-6.0.3p1-1ubuntu0.1.md) | Jan 29, 2020 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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