What is arbitrary code execution in vulnerability?

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Arbitrary code refers to a code which an attacker can run once he has access to a OS or Hardware. Arbitrary is added when the attacker can run any or random code on a system. With this a attacker can trigger a problem that already exists, modify information within a program, load different code, or install a problem to run later. If the vulnerability allows this code execution we should consider it with high severity as the chances once breach has occured is numerous. 

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