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The System Information Library for Node.JS (npm package "systeminformation") is an open source collection of functions to retrieve detailed hardware, system and OS information. In systeminformation before version 5.3.1 there is a command injection vulnerability. Problem was fixed in version 5.3.1. As a workaround instead of upgrading, be sure to check or sanitize service parameters that are passed to si.inetLatency(), si.inetChecksite(), si.services(), si.processLoad() ... do only allow strings, reject any arrays. String sanitation works as expected.
Use CWE-78, Systeminformation vendor hub and Systeminformation product page to widen CVE-2021-21315 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2023-42810, CVE-2021-21388 and CVE-2026-26318 for nearby disclosures in the same product family.