A non-privileged user or program can put code and a config file in a known non-privileged path (under C:/usr/local/) that will make curl <= 7.65.1 automatically run the code (as an openssl "engine") on invocation. If that curl is invoked by a privileged user it can do anything it wants.
http://www.openwall.com/lists/oss-security/2019/06/24/1
https://curl.haxx.se/docs/CVE-2019-5443.html
http://www.securityfocus.com/bid/108881
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
https://security.netapp.com/advisory/ntap-20191017-0002/
Source: MITRE
Published: 2019-07-02
Updated: 2021-11-03
Type: CWE-427
Base Score: 4.4
Vector: AV:L/AC:M/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 3.4
Severity: MEDIUM
Base Score: 7.8
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 1.8
Severity: HIGH