CVE-2020-28018

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

56.75% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 99.0% of scored records. A rank, not a probability.

NVD base score

9.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-05-06 03:58Z5 YR AGO

Last updated

2024-08-04 16:25Z2 YR AGO

Reserved

2020-10-30

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-416Use After FreeVariant

Data version

5.1

Document digest

0ebb66bedac6d4ff272e56fcc4d0477303a020dab63f9e603f121b015c9817bd

• www.exim.orghttps://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28018-OCORK.txtx_refsource_MISC
• www.openwall.com[oss-security] 20210511 [CVE-2020-28018] Use-After-Free on Exim Questionhttp://www.openwall.com/lists/oss-security/2021/05/11/5mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210511 Re: [CVE-2020-28018] Use-After-Free on Exim Questionhttp://www.openwall.com/lists/oss-security/2021/05/11/6mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210511 Re: [CVE-2020-28018] Use-After-Free on Exim Questionhttp://www.openwall.com/lists/oss-security/2021/05/11/17mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210511 Re: [CVE-2020-28018] Use-After-Free on Exim Questionhttp://www.openwall.com/lists/oss-security/2021/05/11/15mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210511 Re: [CVE-2020-28018] Use-After-Free on Exim Questionhttp://www.openwall.com/lists/oss-security/2021/05/11/14mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210512 Re: [CVE-2020-28018] Use-After-Free on Exim Questionhttp://www.openwall.com/lists/oss-security/2021/05/12/2mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210512 Re: [CVE-2020-28018] Use-After-Free on Exim Questionhttp://www.openwall.com/lists/oss-security/2021/05/12/3mailing-listx_refsource_MLIST