Exim 4 before 4.94.2 allows Execution with Unnecessary Privileges. The -oP option is available to the exim user, and allows a denial of service because root-owned files can be overwritten.
https://www.exim.org/static/doc/security/CVE-2020-qualys/CVE-2020-28014-PIDFP.txt
Source: MITRE
Published: 2021-05-06
Updated: 2021-05-10
Type: NVD-CWE-noinfo
Base Score: 5.6
Vector: AV:L/AC:L/Au:N/C:N/I:P/A:C
Impact Score: 7.8
Exploitability Score: 3.9
Severity: MEDIUM
Base Score: 6.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Impact Score: 4.2
Exploitability Score: 1.8
Severity: MEDIUM