Provide references for CVE-2020-28020.
Where can I find more information about CVE-2020-28020?
References are available at: https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28020-HSIZE.txt, http://www.openwall.com/lists/oss-security/2021/07/25/1, http://www.openwall.com/lists/oss-security/2021/08/03/1.