What is the difference?
Vulnerability management involves a constant cycle of identifying, classifying, prioritizing, remediating, and mitigating software vulnerabilities (software weaknesses).
Attack surface reduction aims to decrease the number of exposed open ports and services (network and system weaknesses), resulting in fewer vulnerabilities and limiting the ability of malicious actors to perform attacks.
Both vulnerability management and surface attack reduction share the same main goal: to reduce risk by making the environment more secure.
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