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HTTP Request Smuggling Affecting io.netty:netty-codec-http2 package, versions [,4.1.61.Final)

0.0
medium

Snyk CVSS

    Attack Complexity High
    Integrity High

    Threat Intelligence

    EPSS 2.41% (90th percentile)
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NVD
5.9 medium
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Red Hat
5.9 medium

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  • Snyk ID SNYK-JAVA-IONETTY-1089809
  • published 31 Mar 2021
  • disclosed 31 Mar 2021
  • credit Unknown
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Introduced: 31 Mar 2021

CVE-2021-21409 Open this link in a new tab
CWE-444 Open this link in a new tab

How to fix?

Upgrade io.netty:netty-codec-http2 to version 4.1.61.Final or higher.

Overview

io.netty:netty-codec-http2 is a HTTP2 sub package for the netty library, an event-driven asynchronous network application framework.

Affected versions of this package are vulnerable to HTTP Request Smuggling. The content-length header is not correctly validated if the request only uses a single Http2HeaderFrame with the endStream set to true. This could lead to request smuggling if the request is proxied to a remote peer and translated to HTTP/1.1. This is a follow-up of CVE-2021-21295 which did not fix this specific case.