Is CVE-2020-28024 in the CISA KEV catalog?

No. CVE-2020-28024 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-28024?

CVE-2020-28024 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2020-28024?

CVE-2020-28024 has an EPSS score of 4.07% (89th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-28024?

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

CVE & CISA-KEV Catalog

CVE-2020-28024

CRITICALEPSS 89th pctl

9.8

CVSS v3

NVD

Description

Exim 4 before 4.94.2 allows Buffer Underwrite that may result in unauthenticated remote attackers executing arbitrary commands, because smtp_ungetc was only intended to push back characters, but can actually push back non-character error codes such as EOF.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

exim4Debian

Fixed in:4.94.2-1CVE-2020-28024

exim4Ubuntu

Fixed in:4.82-3ubuntu2.4+esm3USN-4934-2

Fixed in:4.86.2-2ubuntu2.6+esm1USN-4934-2

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

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

exim4-baseUbuntu

Fixed in:4.82-3ubuntu2.4+esm3USN-4934-2

Fixed in:4.86.2-2ubuntu2.6+esm1USN-4934-2

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

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

exim4-daemon-heavyUbuntu

Fixed in:4.82-3ubuntu2.4+esm3USN-4934-2

Fixed in:4.86.2-2ubuntu2.6+esm1USN-4934-2

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

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

exim4-daemon-lightUbuntu

Fixed in:4.82-3ubuntu2.4+esm3USN-4934-2

Fixed in:4.86.2-2ubuntu2.6+esm1USN-4934-2

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 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

4.07%probability of exploitation in 30 days

89thpercentile

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

References

Third-Party Advisory1

exim.org

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	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 2024-11-21.