Vulnerabilities > CVE-2021-21295

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 4.1.60.Final there is a vulnerability that enables request smuggling. If a Content-Length header is present in the original HTTP/2 request, the field is not validated by `Http2MultiplexHandler` as it is propagated up. This is fine as long as the request is not proxied through as HTTP/1.1. If the request comes in as an HTTP/2 stream, gets converted into the HTTP/1.1 domain objects (`HttpRequest`, `HttpContent`, etc.) via `Http2StreamFrameToHttpObjectCodec `and then sent up to the child channel's pipeline and proxied through a remote peer as HTTP/1.1 this may result in request smuggling. In a proxy case, users may assume the content-length is validated somehow, which is not the case. If the request is forwarded to a backend channel that is a HTTP/1.1 connection, the Content-Length now has meaning and needs to be checked. An attacker can smuggle requests inside the body as it gets downgraded from HTTP/2 to HTTP/1.1. For an example attack refer to the linked GitHub Advisory. Users are only affected if all of this is true: `HTTP2MultiplexCodec` or `Http2FrameCodec` is used, `Http2StreamFrameToHttpObjectCodec` is used to convert to HTTP/1.1 objects, and these HTTP/1.1 objects are forwarded to another remote peer. This has been patched in 4.1.60.Final As a workaround, the user can do the validation by themselves by implementing a custom `ChannelInboundHandler` that is put in the `ChannelPipeline` behind `Http2StreamFrameToHttpObjectCodec`.

Vulnerable Configurations

Part	Description	Count
Application	Netty Netty Netty - Netty Netty 3.2.4 Netty Netty 3.2.5 Netty Netty 3.2.6 Netty Netty 3.2.7 Netty Netty 3.2.8 Netty Netty 3.2.9 Netty Netty 3.2.10 Netty Netty 3.3.0 Netty Netty 3.3.1 Netty Netty 3.4.0 Netty Netty 3.4.1 Netty Netty 3.4.2 Netty Netty 3.4.3 Netty Netty 3.4.4 Netty Netty 3.4.5 Netty Netty 3.4.6 Netty Netty 3.5.0 Netty Netty 3.5.1 Netty Netty 3.5.2 Netty Netty 3.5.3 Netty Netty 3.5.4 Netty Netty 3.5.5 Netty Netty 3.5.6 Netty Netty 3.5.7 Netty Netty 3.5.8 Netty Netty 3.5.9 Netty Netty 3.5.10 Netty Netty 3.5.11 Netty Netty 3.5.12 Netty Netty 3.5.13 Netty Netty 3.6.0 Netty Netty 3.6.1 Netty Netty 3.6.2 Netty Netty 3.6.3 Netty Netty 3.6.4 Netty Netty 3.6.5 Netty Netty 3.6.6 Netty Netty 3.6.7 Netty Netty 3.6.8 Netty Netty 3.6.9 Netty Netty 3.6.10 Netty Netty 3.7.0 Netty Netty 3.7.1 Netty Netty 3.8.0 Netty Netty 3.8.1 Netty Netty 3.8.2 Netty Netty 3.8.3 Netty Netty 3.9.0 Netty Netty 3.9.1 Netty Netty 3.9.1.1 Netty Netty 3.9.2 Netty Netty 3.9.3 Netty Netty 3.9.4 Netty Netty 3.9.5 Netty Netty 3.9.6 Netty Netty 3.9.7 Netty Netty 3.9.8 Netty Netty 3.9.9 Netty Netty 3.10.0 Netty Netty 3.10.1 Netty Netty 3.10.2 Netty Netty 3.10.3 Netty Netty 3.10.4 Netty Netty 3.10.5 Netty Netty 3.10.6 Netty Netty 4.0.0 Netty Netty 4.0.1 Netty Netty 4.0.2 Netty Netty 4.0.3 Netty Netty 4.0.4 Netty Netty 4.0.5 Netty Netty 4.0.6 Netty Netty 4.0.7 Netty Netty 4.0.8 Netty Netty 4.0.9 Netty Netty 4.0.10 Netty Netty 4.0.11 Netty Netty 4.0.12 Netty Netty 4.0.13 Netty Netty 4.0.14 Netty Netty 4.0.15 Netty Netty 4.0.16 Netty Netty 4.0.17 Netty Netty 4.0.18 Netty Netty 4.0.19 Netty Netty 4.0.20 Netty Netty 4.0.21 Netty Netty 4.0.22 Netty Netty 4.0.23 Netty Netty 4.0.24 Netty Netty 4.0.25 Netty Netty 4.0.26 Netty Netty 4.0.27 Netty Netty 4.0.28 Netty Netty 4.0.29 Netty Netty 4.0.30 Netty Netty 4.0.31 Netty Netty 4.0.32 Netty Netty 4.0.33 Netty Netty 4.0.34 Netty Netty 4.0.35 Netty Netty 4.0.36 Netty Netty 4.0.37 Netty Netty 4.0.38 Netty Netty 4.0.39 Netty Netty 4.0.40 Netty Netty 4.0.41 Netty Netty 4.0.42 Netty Netty 4.0.43 Netty Netty 4.0.44 Netty Netty 4.0.45 Netty Netty 4.0.46 Netty Netty 4.0.47 Netty Netty 4.0.48 Netty Netty 4.0.49 Netty Netty 4.0.50 Netty Netty 4.0.51 Netty Netty 4.0.52 Netty Netty 4.0.53 Netty Netty 4.0.54 Netty Netty 4.0.55 Netty Netty 4.0.56 Netty Netty 4.1 Netty Netty 4.1.0 Netty Netty 4.1.1 Netty Netty 4.1.2 Netty Netty 4.1.3 Netty Netty 4.1.4 Netty Netty 4.1.5 Netty Netty 4.1.6 Netty Netty 4.1.7 Netty Netty 4.1.8 Netty Netty 4.1.9 Netty Netty 4.1.10 Netty Netty 4.1.11 Netty Netty 4.1.12 Netty Netty 4.1.13 Netty Netty 4.1.14 Netty Netty 4.1.15 Netty Netty 4.1.16 Netty Netty 4.1.17 Netty Netty 4.1.18 Netty Netty 4.1.19 Netty Netty 4.1.20 Netty Netty 4.1.21 Netty Netty 4.1.22 Netty Netty 4.1.23 Netty Netty 4.1.24 Netty Netty 4.1.25 Netty Netty 4.1.26 Netty Netty 4.1.27 Netty Netty 4.1.28 Netty Netty 4.1.29 Netty Netty 4.1.30 Netty Netty 4.1.31 Netty Netty 4.1.32 Netty Netty 4.1.33 Netty Netty 4.1.34 Netty Netty 4.1.35 Netty Netty 4.1.36 Netty Netty 4.1.37 Netty Netty 4.1.38 Netty Netty 4.1.39 Netty Netty 4.1.40 Netty Netty 4.1.41 Netty Netty 4.1.42 Netty Netty 4.1.43 Netty Netty 4.1.44 Netty Netty 4.1.45 Netty Netty 4.1.46 Netty Netty 4.1.47 Netty Netty 4.1.48 Netty Netty 4.1.49 Netty Netty 4.1.50 Netty Netty 4.1.51 Netty Netty 4.1.52 Netty Netty 4.1.53 Netty Netty 4.1.54 Netty Netty 4.1.55 Netty Netty 4.1.56 Netty Netty 4.1.57 Netty Netty 4.1.58 Netty Netty 4.1.59	228
Application	Netapp Netapp Oncommand Workflow Automation - Netapp Oncommand API Services -	2
Application	Quarkus Quarkus Quarkus 0.0.1 Quarkus Quarkus 0.1.0 Quarkus Quarkus 0.2.0 Quarkus Quarkus 0.3.0 Quarkus Quarkus 0.4.0 Quarkus Quarkus 0.5.0 Quarkus Quarkus 0.6.0 Quarkus Quarkus 0.7.0 Quarkus Quarkus 0.8.0 Quarkus Quarkus 0.9.0 Quarkus Quarkus 0.9.1 Quarkus Quarkus 0.10.0 Quarkus Quarkus 0.11.0 Quarkus Quarkus 0.12.0 Quarkus Quarkus 0.13.0 Quarkus Quarkus 0.13.1 Quarkus Quarkus 0.13.2 Quarkus Quarkus 0.13.3 Quarkus Quarkus 0.14.0 Quarkus Quarkus 0.15.0 Quarkus Quarkus 0.16.0 Quarkus Quarkus 0.16.1 Quarkus Quarkus 0.17.0 Quarkus Quarkus 0.18.0 Quarkus Quarkus 0.19.0 Quarkus Quarkus 0.19.1 Quarkus Quarkus 0.20.0 Quarkus Quarkus 0.21.0 Quarkus Quarkus 0.21.1 Quarkus Quarkus 0.21.2 Quarkus Quarkus 0.22.0 Quarkus Quarkus 0.23.0 Quarkus Quarkus 0.23.1 Quarkus Quarkus 0.23.2 Quarkus Quarkus 0.24.0 Quarkus Quarkus 0.25.0 Quarkus Quarkus 0.26.0 Quarkus Quarkus 0.26.1 Quarkus Quarkus 0.27.0 Quarkus Quarkus 0.28.0 Quarkus Quarkus 0.28.1 Quarkus Quarkus 1.0.0 Quarkus Quarkus 1.0.1 Quarkus Quarkus 1.1.0 Quarkus Quarkus 1.1.1 Quarkus Quarkus 1.2.0 Quarkus Quarkus 1.2.1 Quarkus Quarkus 1.3.0 Quarkus Quarkus 1.3.1 Quarkus Quarkus 1.3.2 Quarkus Quarkus 1.3.3 Quarkus Quarkus 1.3.4 Quarkus Quarkus 1.4.0 Quarkus Quarkus 1.4.1 Quarkus Quarkus 1.4.2 Quarkus Quarkus 1.5.0 Quarkus Quarkus 1.5.1 Quarkus Quarkus 1.5.2 Quarkus Quarkus 1.6.0 Quarkus Quarkus 1.6.1 Quarkus Quarkus 1.7.0 Quarkus Quarkus 1.7.1 Quarkus Quarkus 1.7.2 Quarkus Quarkus 1.7.3 Quarkus Quarkus 1.7.4 Quarkus Quarkus 1.7.5 Quarkus Quarkus 1.7.6 Quarkus Quarkus 1.8.0 Quarkus Quarkus 1.8.1 Quarkus Quarkus 1.8.2 Quarkus Quarkus 1.8.3 Quarkus Quarkus 1.9.0 Quarkus Quarkus 1.9.1 Quarkus Quarkus 1.9.2 Quarkus Quarkus 1.10.0 Quarkus Quarkus 1.10.1 Quarkus Quarkus 1.10.2 Quarkus Quarkus 1.10.3 Quarkus Quarkus 1.10.4 Quarkus Quarkus 1.10.5 Quarkus Quarkus 1.11.0 Quarkus Quarkus 1.11.1 Quarkus Quarkus 1.11.2 Quarkus Quarkus 1.11.3 Quarkus Quarkus 1.11.4 Quarkus Quarkus 1.11.5 Quarkus Quarkus 1.11.6 Quarkus Quarkus 1.11.7 Quarkus Quarkus 1.12.0 Quarkus Quarkus 1.12.1 Quarkus Quarkus 1.12.2 Quarkus Quarkus 1.13.0 Quarkus Quarkus 1.13.1 Quarkus Quarkus 1.13.2 Quarkus Quarkus 1.13.3 Quarkus Quarkus 1.13.4 Quarkus Quarkus 1.13.5 Quarkus Quarkus 1.13.6 Quarkus Quarkus 1.13.7	134
Application	Apache Apache Kudu - Apache Kudu 0.7.0 Apache Kudu 0.7.1 Apache Kudu 0.8.0 Apache Kudu 0.9.0 Apache Kudu 0.9.1 Apache Kudu 0.10.0 Apache Kudu 1.0.0 Apache Kudu 1.0.1 Apache Kudu 1.1.0 Apache Kudu 1.2.0 Apache Kudu 1.3.0 Apache Kudu 1.3.1 Apache Kudu 1.4.0 Apache Kudu 1.5.0 Apache Kudu 1.6.0 Apache Kudu 1.7.0 Apache Kudu 1.7.1 Apache Kudu 1.8.0 Apache Kudu 1.9.0 Apache Kudu 1.10.0 Apache Kudu 1.10.1 Apache Kudu 1.11.0 Apache Kudu 1.11.1 Apache Kudu 1.12.0 Apache Kudu 1.13.0 Apache Kudu 1.14.0 Apache Kudu 1.15.0 Apache Zookeeper 3.5.9	77
Application	Oracle Oracle Communications Cloud Native Core Policy 1.14.0	1
OS	Debian Debian Debian Linux 10.0	1

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Summary

Vulnerable Configurations

References

Vulnerabilities > CVE-2021-21295