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How the CVE Works:
CVE-2021-22931 is a critical vulnerability in Node.js that allows remote code execution due to improper input validation in the `http2` module. Attackers can exploit this flaw by sending a specially crafted HTTP/2 request, triggering an out-of-bounds write or read. This occurs because Node.js fails to properly handle certain malicious header fields, leading to memory corruption. The exploit can bypass security restrictions, enabling arbitrary code execution under the Node.js process context.
DailyCVE Form:
Platform: Node.js
Version: 12.x – 16.x
Vulnerability: HTTP/2 RCE
Severity: Critical
Date: 2021-09-07
Prediction: Patch by 2021-09-14
What Undercode Say:
Check Node.js version node -v Verify HTTP/2 module usage grep -r "http2" /path/to/app Mitigation command (upgrade) npm install -g n && n stable
How Exploit:
- Craft malicious HTTP/2 headers
- Send payload via HTTP/2 stream
- Trigger memory corruption
Protection from this CVE:
- Upgrade to Node.js 12.22.6, 14.17.6, or 16.6.2
- Disable HTTP/2 if unused
- Apply input sanitization
Impact:
- Full system compromise
- Data exfiltration
- Service disruption
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
