CVE-2021-21388

HIGHNVD 8.98.9—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.9 under NVD CVSS v3. EPSS exploit probability: 1.9%, top 23% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 8.9Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.9
EG Score
8.9(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity89% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
77%
KEV
Not listed

Published

April 29, 2021

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Jul 26, 2026
Patch available. Sources: github, github_commit.
github Patch Available

Command Injection Vulnerability in systeminformation · Advisory · sebhildebrandt/systeminformation · GitHub

https://github.com/sebhildebrandt/systeminformation/security/advisories/GHSA-jff2-qjw8-5476
github_commit Patch Available

commit 7922366d707d (sebhildebrandt/systeminformation)

Patch available: sebhildebrandt/systeminformation v5.30.0 (contains commit 7922366d707d)

https://github.com/sebhildebrandt/systeminformation/commit/7922366d707de7f20995fc8e30ac3153636bf35f
github_commit Patch Available

commit 0be6fcd575c0 (sebhildebrandt/systeminformation)

Patch available: sebhildebrandt/systeminformation v5.30.0 (contains commit 0be6fcd575c0)

https://github.com/sebhildebrandt/systeminformation/commit/0be6fcd575c05687d1076d5cd6d75af2ebae5a46
github_commit Patch Available

commit 01ef56cd5824 (sebhildebrandt/systeminformation)

Patch available: sebhildebrandt/systeminformation v5.30.0 (contains commit 01ef56cd5824)

https://github.com/sebhildebrandt/systeminformation/commit/01ef56cd5824ed6da1c11b37013a027fdef67524

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
systeminformation—5.6.4—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 104 total refreshes for this CVE.

  1. 2026-07-26 14:52 UTCEPSS rescore
  2. 2026-07-25 14:15 UTCEPSS rescore
  3. 2026-07-24 14:15 UTCEPSS rescore
  4. 2026-07-23 14:15 UTCEPSS rescore
  5. 2026-07-23 01:57 UTCEG score recompute
  6. 2026-07-22 22:43 UTCEG score recompute
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  1. 2026-07-07 13:43 UTCEPSS rescore
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  11. 2026-07-01 04:18 UTCOSV refresh
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  42. 2026-06-13 07:13 UTCOSV refresh
  43. 2026-06-12 23:10 UTCEPSS rescore
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  73. 2026-05-27 13:39 UTCEPSS rescore
  74. 2026-05-26 17:14 UTCEG score recompute
  75. 2026-05-26 13:42 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-21388?
CVE-2021-21388 is a high vulnerability published on April 29, 2021. 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…
When was CVE-2021-21388 disclosed?
CVE-2021-21388 was first published in the National Vulnerability Database on April 29, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-21388 actively exploited?
CVE-2021-21388 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 23.1% of all scored CVEs.
What is the CVSS score of CVE-2021-21388?
CVE-2021-21388 has a CVSS v3 base score of 8.9 (NVD).
How do I remediate CVE-2021-21388?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-21388, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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