CVE-2021-21388

Name: CVE-2021-21388
Creator: NVD / NIST
Published: 2021-04-29T18:15:09.54+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.85%

Last modified Jun 17, 2026

CVE-2021-21388 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. systeminformation is an open source system and OS information library for node.js. A command injection vulnerability has been discovered in versions of systeminformation prior to 5.6.4. EPSS estimates a 1.85% chance of exploitation in the next 30 days.

Description

systeminformation is an open source system and OS information library for node.js. A command injection vulnerability has been discovered in versions of systeminformation prior to 5.6.4. The issue has been fixed with a parameter check on user input. Please upgrade to version >= 5.6.4. If you cannot upgrade, be sure to check or sanitize service parameters that are passed to si.inetLatency(), si.inetChecksite(), si.services(), si.processLoad() and other commands. Only allow strings, reject any arrays. String sanitation works as expected.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.85%

76.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Systeminformation	Systeminformation	< 5.6.4

References

https://github.com/sebhildebrandt/systeminformation/commit/01ef56cd5824ed6da1c11b37013a027fdef67524Patch, Third Party Advisory
https://github.com/sebhildebrandt/systeminformation/commit/0be6fcd575c05687d1076d5cd6d75af2ebae5a46Patch, Third Party Advisory
https://github.com/sebhildebrandt/systeminformation/commit/7922366d707de7f20995fc8e30ac3153636bf35fPatch, Third Party Advisory
https://github.com/sebhildebrandt/systeminformation/security/advisories/GHSA-jff2-qjw8-5476Third Party Advisory
https://www.npmjs.com/package/systeminformationProduct, Third Party Advisory
https://github.com/sebhildebrandt/systeminformation/commit/01ef56cd5824ed6da1c11b37013a027fdef67524Patch, Third Party Advisory
https://github.com/sebhildebrandt/systeminformation/commit/0be6fcd575c05687d1076d5cd6d75af2ebae5a46Patch, Third Party Advisory
https://github.com/sebhildebrandt/systeminformation/commit/7922366d707de7f20995fc8e30ac3153636bf35fPatch, Third Party Advisory
https://github.com/sebhildebrandt/systeminformation/security/advisories/GHSA-jff2-qjw8-5476Third Party Advisory
https://www.npmjs.com/package/systeminformationProduct, Third Party Advisory

Timeline

Published: Apr 29, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21388?

How severe is CVE-2021-21388?

CVE-2021-21388 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.85% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21388?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-21388?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST