---
title: "CVE-2020-28018: Exim 4 before 4.94.2 allows Use… | CubePath"
description: "Exim 4 before 4.94.2 allows Use After Free in smtp_reset in certain situations that may be common for builds with OpenSSL."
language: en
source: https://cubepath.com/security/cve/CVE-2020-28018
---

# CVE-2020-28018: Exim 4 before 4.94.2 allows Use… | CubePath

## Description

Exim 4 before 4.94.2 allows Use After Free in smtp\_reset in certain situations that may be common for builds with OpenSSL.

Official description from the CVE record, published by mitre. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2020-28018)

## Key data

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.56475 (56.5% probability)

Percentile

99.1%

Scores of

Nov 10, 2026

Model

v2026.06.15

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28018…](https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28018-OCORK.txt)
- [\[oss-security\] 20210511 \[CVE-2020-28018\] Use-After-Free on Exim Question](http://www.openwall.com/lists/oss-security/2021/05/11/5)  (openwall.com) mailing-list
- [\[oss-security\] 20210511 Re: \[CVE-2020-28018\] Use-After-Free on Exim Question](http://www.openwall.com/lists/oss-security/2021/05/11/6)  (openwall.com) mailing-list
- [\[oss-security\] 20210511 Re: \[CVE-2020-28018\] Use-After-Free on Exim Question](http://www.openwall.com/lists/oss-security/2021/05/11/17)  (openwall.com) mailing-list
- [\[oss-security\] 20210511 Re: \[CVE-2020-28018\] Use-After-Free on Exim Question](http://www.openwall.com/lists/oss-security/2021/05/11/15)  (openwall.com) mailing-list
- [\[oss-security\] 20210511 Re: \[CVE-2020-28018\] Use-After-Free on Exim Question](http://www.openwall.com/lists/oss-security/2021/05/11/14)  (openwall.com) mailing-list
- [\[oss-security\] 20210512 Re: \[CVE-2020-28018\] Use-After-Free on Exim Question](http://www.openwall.com/lists/oss-security/2021/05/12/2)  (openwall.com) mailing-list
- [\[oss-security\] 20210512 Re: \[CVE-2020-28018\] Use-After-Free on Exim Question](http://www.openwall.com/lists/oss-security/2021/05/12/3)  (openwall.com) mailing-list

## Timeline

1. ID reserved Oct 30, 2020
2. Record published May 6, 2021
3. Record last updated Aug 4, 2024

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## About CubePath

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:03 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)