Is CVE-2020-28021 in the CISA KEV catalog?

No. CVE-2020-28021 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-28021?

CVE-2020-28021 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2020-28021?

CVE-2020-28021 has an EPSS score of 4.06% (89th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-28021?

Upgrade exim4 on debian 11 to 4.94.2-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2020-28021

HIGHEPSS 89th pctl

8.8

CVSS v3

NVD

Description

Exim 4 before 4.94.2 has Improper Neutralization of Line Delimiters. An authenticated remote SMTP client can insert newline characters into a spool file (which indirectly leads to remote code execution as root) via AUTH= in a MAIL FROM command.

How to fix

Remediation Available

exim4Debian

Fixed in:4.94.2-1CVE-2020-28021

exim4Ubuntu

Fixed in:4.90.1-1ubuntu1.8USN-4934-1

Fixed in:4.93-13ubuntu1.5USN-4934-1

exim4-baseUbuntu

Fixed in:4.90.1-1ubuntu1.8USN-4934-1

Fixed in:4.93-13ubuntu1.5USN-4934-1

exim4-daemon-heavyUbuntu

Fixed in:4.90.1-1ubuntu1.8USN-4934-1

Fixed in:4.93-13ubuntu1.5USN-4934-1

exim4-daemon-lightUbuntu

Fixed in:4.90.1-1ubuntu1.8USN-4934-1

Fixed in:4.93-13ubuntu1.5USN-4934-1

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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

4.06%probability of exploitation in 30 days

89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Vendor Advisory1

exim.org

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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 2024-11-21.