CVE-2020-28023

Name: CVE-2020-28023
Creator: NVD / NIST
Published: 2021-05-06T13:15:09.697+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.56%

Last modified Jun 17, 2026

CVE-2020-28023 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Exim 4 before 4.94.2 allows Out-of-bounds Read. smtp_setup_msg may disclose sensitive information from process memory to an unauthenticated SMTP client.. EPSS estimates a 2.56% chance of exploitation in the next 30 days.

Description

Exim 4 before 4.94.2 allows Out-of-bounds Read. smtp_setup_msg may disclose sensitive information from process memory to an unauthenticated SMTP client.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.56%

83.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Exim	Exim	>= 4.00, < 4.94.2

References

https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28023-SCHAD.txtThird Party Advisory
https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28023-SCHAD.txtThird Party Advisory

Timeline

Published: May 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-28023?

Exim 4 before 4.94.2 allows Out-of-bounds Read. smtp_setup_msg may disclose sensitive information from process memory to an unauthenticated SMTP client.

How severe is CVE-2020-28023?

CVE-2020-28023 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.56% probability of exploitation in the next 30 days.

How do I fix CVE-2020-28023?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-28023?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST