Service interruption via unbounded chunk extensions
Published Feb 20, 2024 · Updated Nov 4, 2025
Resource exhaustion in Node.js HTTP servers through 21.6.1 allows remote attackers to interrupt service with chunked requests. The llhttp-backed HTTP parser accepted an unbounded number of chunk-extension bytes on one connection because it did not count or cap them. A reachable Node.js HTTP server is required; one crafted connection can exhaust CPU and network bandwidth while bypassing request timeouts and body-size limits.
Summary
What happened
Resource exhaustion in Node.js HTTP servers through 21.6.1 allows remote attackers to interrupt service with chunked requests. The llhttp-backed HTTP parser accepted an unbounded number of chunk-extension bytes on one connection because it did not count or cap them. A reachable Node.js HTTP server is required; one crafted connection can exhaust CPU and network bandwidth while bypassing request timeouts and body-size limits.
The record
- CVE
- CVE-2024-22019
- Published
- Feb 20, 2024
- Updated
- Nov 4, 2025
- Vendor
- Node.js
- Product
- Node.js
- Classifications
- CWE-404, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 20, 2024CVE publishedPublication date reported by the CVE source.
- Nov 4, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=21.6.1
- Affected versionversion=10.0 <10.*
- Affected versionversion=11.0 <11.*
- Affected versionversion=12.0 <12.*
- Affected versionversion=13.0 <13.*
- Affected versionversion=14.0 <14.*
- Affected versionversion=15.0 <15.*
- Affected versionversion=16.0 <16.*
- Affected versionversion=17.0 <17.*
- Affected versionversion=18.0 <18.19.1
- Affected versionversion=19.0 <19.*
- Affected versionversion=20.0 <20.11.1
- Affected versionversion=21.0 <21.6.2
- Affected versionversion=4.0 <4.*
- Affected versionversion=5.0 <5.*
- Affected versionversion=6.0 <6.*
- Affected versionversion=7.0 <7.*
- Affected versionversion=8.0 <8.*
- Affected versionversion=9.0 <9.*
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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