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CVE-2021-32640

Vulnerability in ws (CVE-2021-32640)

Summary

Vulnerability in ws (CVE-2021-32640). Risk of unauthorized operations or information disclosure. Exploitable via maxHeaderSize. Mitigation: upgrade to 5.2.3 or later.

Original description

The description as published by the source.

ws is an open source WebSocket client and server library for Node.js. A specially crafted value of the Sec-Websocket-Protocol header can be used to significantly slow down a ws server. The vulnerability has been fixed in ws@7.4.6 (https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff). In vulnerable versions of ws, the issue can be mitigated by reducing the maximum allowed length of the request headers using the --max-http-header-size=size and/or the maxHeaderSize options.

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2021-32640 has been found in ws.
Attackers can target a specific entry point like maxHeaderSize over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade ws to 5.2.3 or later.
If unsure, ask your IT team or search "ws CVE-2021-32640" on the vendor's site.

CVE-2021-32640 (ws) — CWE-345
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: maxHeaderSize
Patched: 5.2.3 — apply immediately
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-345) exists in ws. Attackers reach the vulnerable code path via maxHeaderSize without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of ws. Attack surface: maxHeaderSize.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 5.2.3.

🛡️ 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 'ws' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

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

  1. 1
    Identify exposure identify 
    grep -r 'ws' . | 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 ws を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade ws to 5.2.3

    ステージング環境で 5.2.3 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を含めること。

  3. 3
    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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

npm ws
[{"type":"SEMVER","events":[{"introduced":"5.0.0"},{"fixed":"5.2.3"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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