How severe is CVE-2021-21388?

CVE-2021-21388 has a CVSS 3.x base score of 8.9, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity low, and availability high.

Is CVE-2021-21388 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21388?

CVE-2021-21388 affects Systeminformation. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21388?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-21388 published?

CVE-2021-21388 was published on 2021-04-29 and last updated on 2026-06-17.

CVE-2021-21388

CVE-2021-21388 is a high-severity vulnerability in Systeminformation with a CVSS 3.x base score of 8.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 8.9)
CVSS v2: 7.5
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Systeminformation
Published: 2021-04-29
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-21388?: 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.
How severe is CVE-2021-21388?: CVE-2021-21388 has a CVSS 3.x base score of 8.9, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity low, and availability high.
Is CVE-2021-21388 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21388?: CVE-2021-21388 affects Systeminformation. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21388?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-21388 published?: CVE-2021-21388 was published on 2021-04-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:systeminformation:systeminformation:*:*:*:*:*:node.js:*:*

More vulnerabilities in Systeminformation

CVE-2023-42810 — Critical (CVSS 9.8): systeminformation is a System Information Library for Node.JS. Versions 5.0.0 through 5.21.6 have a SSID Command…
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CVE-2020-7752 — High (CVSS 8.8): This affects the package systeminformation before 4.27.11. This package is vulnerable to Command Injection. The…
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CVE-2025-68154 — High (CVSS 8.1): systeminformation is a System and OS information library for node.js. In versions prior to 5.27.14, the `fsSize()`…
CVE-2020-26245 — High (CVSS 8.1): npm package systeminformation before version 4.30.5 is vulnerable to Prototype Pollution leading to Command Injection.…

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