Vulnerability CVE-2020-28018
Published: 2021-05-06

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.

See advisories in our WLB2 database:
Topic
Author
Date
High
Exim tls-openssl.c — Use-After-Free: unauthenticated Remote Code Execution
CyberSploit
01.11.2025

Type:

CWE-416

 (Use After Free)

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.5/10
6.4/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
EXIM -> EXIM 

 References:
https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28018-OCORK.txt
http://www.openwall.com/lists/oss-security/2021/05/11/5
http://www.openwall.com/lists/oss-security/2021/05/11/6
http://www.openwall.com/lists/oss-security/2021/05/11/17
http://www.openwall.com/lists/oss-security/2021/05/11/15
http://www.openwall.com/lists/oss-security/2021/05/11/14
http://www.openwall.com/lists/oss-security/2021/05/12/2
http://www.openwall.com/lists/oss-security/2021/05/12/3
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