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CVE-2021-21409 PUBLISHED

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.

EPSS 2.55% · 85.3th percentile

Risk Scores

EPSS Score
2.55%
85.3th percentile

Affected Products

VendorProductVersions
Ubuntu:Pro:16.04:LTSnetty1:4.0.32-1, 1:4.0.33-1, 1:4.0.34-1
Ubuntu:Pro:18.04:LTSnetty1:4.1.7-4ubuntu0.1~esm1, 0, *
Ubuntu:Pro:20.04:LTSnetty1:4.1.33-2, 0, 1:4.1.45-1
Ubuntu:22.04:LTSnetty1:4.1.48-4, 0
Ubuntu:Pro:14.04:LTSnetty1:3.2.6.Final-2, 0, 1:3.2.6.Final-2+deb8u2build0.14.04.1~esm1

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