CVE-2024-40642Network attack vector

Request injection via unvalidated Binary HTTP fields

Published Jul 18, 2024 · Updated Aug 2, 2024

Improper input validation in Netty codec-bhttp before 0.0.13.Final allows remote attackers to inject crafted HTTP requests. BinaryHttpParser.readRequestHead converts attacker-controlled method, scheme, authority, and path slices to strings and constructs DefaultBinaryHttpRequest without validating them. Applications that trust the library to validate Binary HTTP input can expose request smuggling, desynchronization, header injection, cache poisoning, SSRF, or cross-protocol injection.

CVSS severity8.1
High
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper input validation in Netty codec-bhttp before 0.0.13.Final allows remote attackers to inject crafted HTTP requests. BinaryHttpParser.readRequestHead converts attacker-controlled method, scheme, authority, and path slices to strings and constructs DefaultBinaryHttpRequest without validating them. Applications that trust the library to validate Binary HTTP input can expose request smuggling, desynchronization, header injection, cache poisoning, SSRF, or cross-protocol injection.

The record

CVE
CVE-2024-40642
Published
Jul 18, 2024
Updated
Aug 2, 2024
Vendor
The Netty Project
Product
Netty/Incubator/Codec/OHTTP
Classifications
CWE-20, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.0.13.Final
  2. Affected versionversion=< 0.0.13.Final

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Netty Project · Netty/Incubator/Codec/OHTTPversion=0 <0.0.13.Final; version=< 0.0.13.Final

Published CVSS scores

8.1GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1190Exploit Public-Facing Application

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo