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CVE-2021-21315 CISA KEV high

[KEV] OS Command Injection in Npm package systeminformation (CVE-2021-21315)

Summary

OS command injection in Npm package systeminformation (CVE-2021-21315). Successful exploitation can lead to full system takeover. Listed in CISA KEV — actively exploited. Mitigation: upgrade to `5.3.1` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2021-21315** has been found in Npm package systeminformation. Successful exploitation can lead to full system takeover. CVSS score: ?/10. Note: CISA has officially confirmed this is **actively exploited in the wild**. Treat it with elevated urgency. What to do: upgrade Npm package systeminformation to **5.3.1** or later. If unsure, ask your IT team or search "Npm package systeminformation CVE-2021-21315" on the vendor's site.
CVE-2021-21315 (Npm package systeminformation) — CWE-78 / Attack vector: local / no user interaction Patched: `5.3.1` — apply immediately Listed in CISA KEV — actively exploited, treat as top priority. Workaround: If you cannot upgrade, be sure to check or sanitize service parameters that are passed to si.inetLatency(), si.inetChecksite(), si.services(), si.processLoad() ... Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs. Refs: see the GHSA / vendor advisory / patched release linked on this page.
❓ What is the problem
**OS command injection** (CWE-78) exists in Npm package systeminformation.
📍 Affected scope
Npm package systeminformation — .
🔥 Severity
Severity: High. Successful exploitation can lead to full system takeover **Listed in CISA KEV** — actively exploited in the wild, treat as top priority.
🔧 How to fix
Update to **5.3.1**.
🛡️ Workaround
Workaround: If you cannot upgrade, be sure to check or sanitize service parameters that are passed to si.inetLatency(), si.inetChecksite(), si.services(), si.processLoad() ...
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'systeminformation' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response Actions (7 steps)

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify
    grep -r 'systeminformation' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `systeminformation` を grep し、稼働しているサービス・バージョンを把握する。

  2. 4
    Consider incident declaration escalate
    Notify SOC / on-call

    CISA KEV登録済 = 実環境で悪用が観測されている。Step 3 で兆候があればインシデント対応宣言、無くてもパッチ適用までWAF強化を最優先で。

  3. 5
    Apply temporary workaround mitigate
    If you cannot upgrade, be sure to check or sanitize service parameters that are passed to si.inetLatency(), si.inetChecksite(), si.services(), si.processLoad() ...

    パッチが適用されるまでの応急処置として、If you cannot upgrade, be sure to check or sanitize service parameters that are passed to si.inetLatency(), si.inetChecksite(), si.services(), si.processLoad() ... を実施。回避策の副作用 (機能低下) を確認した上で。

  4. 6
    Apply patch patch
    Upgrade systeminformation to 5.3.1

    ステージング環境で 5.3.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。

  5. 7
    Post-deployment verification verify
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。

Affected packages

npm systeminformation
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.3.1"}]}]

References

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