Is CVE-2020-7247 in the CISA KEV catalog?

Yes. CVE-2020-7247 is on the CISA Known Exploited Vulnerabilities list, added 2022-03-25.

What is the CVSS severity of CVE-2020-7247?

CVE-2020-7247 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2020-7247?

CVE-2020-7247 has an EPSS score of 98.95% (100th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-7247?

Upgrade opensmtpd on debian 11 to 6.6.2p1-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2020-7247

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

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.

CWE-78OS Command Injection CWE-755

How to fix

Remediation Available

opensmtpdDebian

Fixed in:6.6.2p1-1CVE-2020-7247

opensmtpdUbuntu

Fixed in:5.4.1p1-1ubuntu0.1~esm1USN-4875-1

Fixed in:5.7.3p2-1ubuntu0.1~esm2USN-4875-1

Fixed in:6.0.3p1-1ubuntu0.1USN-4268-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

98.95%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

OpenSMTPD Remote Code Execution Vulnerability

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.

Apply updates per vendor instructions.

Remediation due: 2022-04-15

References

Patch2

Exploit6

Third-Party Advisory6

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-78 (OS Command Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-1498	Critical	9.8	100%	KEV	Fix
CVE-2014-6271	Critical	9.8	100%	KEV	Fix
CVE-2019-16920	Critical	9.8	100%	KEV	-
CVE-2022-44877	Critical	9.8	100%	KEV	Fix
CVE-2020-8515	Critical	9.8	100%	KEV	-
CVE-2020-9054	Critical	9.8	100%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-07.