CVE-2021-22940
📋 TL;DR
CVE-2021-22940 is a use-after-free vulnerability in Node.js that allows memory corruption attacks. An attacker could exploit this to potentially execute arbitrary code or crash the Node.js process. This affects all applications running vulnerable Node.js versions.
💻 Affected Systems
- Node.js
📦 What is this software?
Graalvm by Oracle
Graalvm by Oracle
Node.js by Nodejs
Node.js by Nodejs
Node.js by Nodejs
Peoplesoft Enterprise Peopletools by Oracle
Peoplesoft Enterprise Peopletools by Oracle
Peoplesoft Enterprise Peopletools by Oracle
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Denial of service through process crashes, memory corruption leading to unpredictable behavior, or limited code execution.
If Mitigated
Minimal impact if patched promptly; isolated container environments limit lateral movement.
🎯 Exploit Status
Exploitation requires specific conditions but has been demonstrated in security reports.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Node.js 16.6.1, 14.17.5, or 12.22.5 and later
Vendor Advisory: https://nodejs.org/en/blog/vulnerability/aug-2021-security-releases/
Restart Required: Yes
Instructions:
1. Identify current Node.js version using 'node --version'. 2. Update to patched version using your package manager (npm, apt, yum, etc.). 3. Restart all Node.js applications and services.
🔧 Temporary Workarounds
Container isolation
allRun Node.js applications in isolated containers with minimal privileges
docker run --read-only --cap-drop=ALL -u nobody node:latest
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable Node.js instances
- Deploy runtime application self-protection (RASP) or WAF with memory protection rules
🔍 How to Verify
Check if Vulnerable:
Run 'node --version' and compare against affected versions (below 16.6.1, 14.17.5, or 12.22.5)Check Version:
node --versionVerify Fix Applied:
Run 'node --version' and confirm version is 16.6.1+, 14.17.5+, or 12.22.5+📡 Detection & Monitoring
Log Indicators:
- Unexpected Node.js process crashes
- Memory access violation errors in application logs
- Abnormal memory usage patterns
Network Indicators:
- Unusual outbound connections from Node.js processes
- Traffic patterns suggesting exploitation attempts
SIEM Query:
source="nodejs" AND (event_type="crash" OR error="segmentation fault" OR error="access violation")🔗 References
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- https://hackerone.com/reports/1238162
- https://lists.debian.org/debian-lts-announce/2022/10/msg00006.html
- https://nodejs.org/en/blog/vulnerability/aug-2021-security-releases/
- https://security.gentoo.org/glsa/202401-02
- https://security.netapp.com/advisory/ntap-20210923-0001/
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
- https://hackerone.com/reports/1238162
- https://lists.debian.org/debian-lts-announce/2022/10/msg00006.html
- https://nodejs.org/en/blog/vulnerability/aug-2021-security-releases/
- https://security.gentoo.org/glsa/202401-02
- https://security.netapp.com/advisory/ntap-20210923-0001/
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://www.oracle.com/security-alerts/cpuoct2021.html
