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Moderate severityNVD Advisory· Published Mar 30, 2021· Updated Aug 3, 2024

Possible request smuggling in HTTP/2 due missing validation of content-length

CVE-2021-21409

Description

Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty (io.netty:netty-codec-http2) before version 4.1.61.Final there is a vulnerability that enables request smuggling. The content-length header is not correctly validated if the request only uses a single Http2HeaderFrame with the endStream set to 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 followup of GHSA-wm47-8v5p-wjpj/CVE-2021-21295 which did miss to fix this one case. This was fixed as part of 4.1.61.Final.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-codec-http2Maven
>= 4.0.0, < 4.1.61.Final4.1.61.Final
org.jboss.netty:nettyMaven
>= 0—
io.netty:nettyMaven
>= 0—

Affected products

11

Patches

Vulnerability mechanics

References

111

News mentions

0

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