SOURCE FACT
Apache · HTTP Server
Apache HTTP Server, with MPM event, worker or prefork, code executing in less-privileged child processes or threads (including scripts executed by an in-process scripting interpreter) could execute code with the privileges of the parent process (usually root) by manipulating the scoreboard.
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CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2019-0211
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