CVE-2020-28020

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

Exim 4 before 4.92 allows Integer Overflow to Buffer Overflow, in which an unauthenticated remote attacker can execute arbitrary code by leveraging the mishandling of continuation lines during header-length restriction.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-190

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

http://www.openwall.com/lists/oss-security/2021/07/25/1Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/08/03/1Mailing List, Third Party Advisory
https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28020-HSIZE.txtPatch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/07/25/1Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/08/03/1Mailing List, Third Party Advisory
https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28020-HSIZE.txtPatch, Third Party Advisory

Timeline

Published: May 6, 2021
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2020

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