# HTTP request smuggling in netty

Advisory record · `GHSA-wx5j-54mm-rqqq`

- **Identifiers:** `GHSA-wx5j-54mm-rqqq` · `CVE-2021-43797`
- **State:** Confirmed
- **Severity:** CVSS 6.5 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-444](https://cwe.mitre.org/data/definitions/444.html)
- **Tags:** [HTTP request smuggling](https://agentprime.io/advisories/tag/request-smuggling.md)
- **Published:** 9 Dec 2021
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 9 Dec 2021, 19:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `io.netty:netty-codec-http` (Maven): affected `>=4.0.0, <4.1.71.Final`; fixed in `4.1.71.Final`
- `org.jboss.netty:netty` (Maven): affected `all versions`; no fixed version yet
- `io.netty:netty` (Maven): affected `all versions`; no fixed version yet

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.5 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.029, the 86th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:18 UTC: First seen by agentprime
- 31 Oct 2026, 14:18 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-wx5j-54mm-rqqq)

## Sources

- [GitHub Advisory Database: GHSA-wx5j-54mm-rqqq](https://github.com/advisories/GHSA-wx5j-54mm-rqqq)
- [OSV: GHSA-wx5j-54mm-rqqq](https://osv.dev/vulnerability/GHSA-wx5j-54mm-rqqq)
- <https://github.com/netty/netty/security/advisories/GHSA-wx5j-54mm-rqqq>
- <https://nvd.nist.gov/vuln/detail/CVE-2021-43797>
- <https://github.com/netty/netty/pull/11891>
- <https://github.com/netty/netty/commit/07aa6b5938a8b6ed7a6586e066400e2643897323>
- <https://github.com/netty/netty>
- <https://lists.debian.org/debian-lts-announce/2023/01/msg00008.html>
- <https://security.netapp.com/advisory/ntap-20220107-0003>
- <https://www.debian.org/security/2023/dsa-5316>
- <https://www.oracle.com/security-alerts/cpuapr2022.html>
- <https://www.oracle.com/security-alerts/cpujul2022.html>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-wx5j-54mm-rqqq>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-wx5j-54mm-rqqq/>. Everything for agents: <https://agentprime.io/llms.txt>.