Exim supports the use of multiple "-p" command line arguments which are malloc()'ed and never free()'ed, used in conjunction with other issues allows attackers to cause arbitrary code execution. This affects exim version 4.89 and earlier. Please note that at this time upstream has released a patch (commit 65e061b76867a9ea7aeeb535341b790b90ae6c21), but it is not known if a new point release is available that addresses this issue at this time.
http://www.debian.org/security/2017/dsa-3888
http://www.securityfocus.com/bid/99252
http://www.securitytracker.com/id/1038779
https://access.redhat.com/security/cve/CVE-2017-1000369
https://github.com/Exim/exim/commit/65e061b76867a9ea7aeeb535341b790b90ae6c21
https://security.gentoo.org/glsa/201709-19
https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt
Source: MITRE
Published: 2017-06-19
Updated: 2019-12-12
Type: CWE-404
Base Score: 2.1
Vector: AV:L/AC:L/Au:N/C:N/I:P/A:N
Impact Score: 2.9
Exploitability Score: 3.9
Severity: LOW
Base Score: 4
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Impact Score: 1.4
Exploitability Score: 2.5
Severity: MEDIUM