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CVE-2021-47996 high CVSS 7.5

Buffer Overflow in dos (CVE-2021-47996)

Summary

vulnerability in dos (CVE-2021-47996). Risk of unauthorized operations or information disclosure.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2021-47996** has been found in dos. Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10. What to do: apply the vendor's official patched release. If unsure, ask your IT team or search "dos CVE-2021-47996" on the vendor's site.
CVE-2021-47996 (dos) — CWE-119 / CVSS v3 7.5 Attack vector: remote (network-reachable) / unauthenticated / no user interaction 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
**A vulnerability** (CWE-119) exists in dos.
📍 Affected scope
dos — .
🔥 Severity
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to the patched release per vendor advisory.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'dos' .` 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 'dos' . | 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 `dos` を grep し、稼働しているサービス・バージョンを把握する。

  2. 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。

References

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