{"schema_version":"1.7.3","id":"GHSA-f256-j965-7f32","published":"2021-03-30T15:10:38Z","modified":"2026-02-04T04:31:34.813972Z","aliases":["CVE-2021-21409"],"related":["CGA-w5v7-493q-c2hq","CVE-2021-21409"],"summary":"Possible request smuggling in HTTP/2 due missing validation of content-length","details":"### Impact\nThe content-length header is not correctly validated if the request only use 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\n\nThis is a followup of https://github.com/netty/netty/security/advisories/GHSA-wm47-8v5p-wjpj which did miss to fix this one case. \n\n### Patches\nThis was fixed as part of 4.1.61.Final\n\n### Workarounds\nValidation can be done by the user before proxy the request by validating the header.","affected":[{"package":{"name":"io.netty:netty-codec-http2","ecosystem":"Maven","purl":"pkg:maven/io.netty/netty-codec-http2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.1.61.Final"}]}],"versions":["4.1.0.Beta4","4.1.0.Beta5","4.1.0.Beta6","4.1.0.Beta7","4.1.0.Beta8","4.1.0.CR1","4.1.0.CR2","4.1.0.CR3","4.1.0.CR4","4.1.0.CR5","4.1.0.CR6","4.1.0.CR7","4.1.0.Final","4.1.1.Final","4.1.10.Final","4.1.11.Final","4.1.12.Final","4.1.13.Final","4.1.14.Final","4.1.15.Final","4.1.16.Final","4.1.17.Final","4.1.18.Final","4.1.19.Final","4.1.2.Final","4.1.20.Final","4.1.21.Final","4.1.22.Final","4.1.23.Final","4.1.24.Final","4.1.25.Final","4.1.26.Final","4.1.27.Final","4.1.28.Final","4.1.29.Final","4.1.3.Final","4.1.30.Final","4.1.31.Final","4.1.32.Final","4.1.33.Final","4.1.34.Final","4.1.35.Final","4.1.36.Final","4.1.37.Final","4.1.38.Final","4.1.39.Final","4.1.4.Final","4.1.40.Final","4.1.41.Final","4.1.42.Final","4.1.43.Final","4.1.44.Final","4.1.45.Final","4.1.46.Final","4.1.47.Final","4.1.48.Final","4.1.49.Final","4.1.5.Final","4.1.50.Final","4.1.51.Final","4.1.52.Final","4.1.53.Final","4.1.54.Final","4.1.55.Final","4.1.56.Final","4.1.57.Final","4.1.58.Final","4.1.59.Final","4.1.6.Final","4.1.60.Final","4.1.7.Final","4.1.8.Final","4.1.9.Final"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/03/GHSA-f256-j965-7f32/GHSA-f256-j965-7f32.json"}},{"package":{"name":"org.jboss.netty:netty","ecosystem":"Maven","purl":"pkg:maven/org.jboss.netty/netty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.0.CR1","3.0.0.CR2","3.0.0.CR3","3.0.0.CR4","3.0.0.CR5","3.0.0.GA","3.0.1.GA","3.0.2.GA","3.1.0.ALPHA1","3.1.0.ALPHA2","3.1.0.ALPHA3","3.1.0.ALPHA4","3.1.0.BETA1","3.1.0.BETA2","3.1.0.BETA3","3.1.0.CR1","3.1.0.GA","3.1.1.GA","3.1.2.GA","3.1.3.GA","3.1.4.GA","3.1.5.GA","3.2.0.ALPHA1","3.2.0.ALPHA2","3.2.0.ALPHA3","3.2.0.ALPHA4","3.2.0.BETA1","3.2.0.CR1","3.2.0.Final","3.2.1.Final","3.2.10.Final","3.2.2.Final","3.2.3.Final","3.2.4.Final","3.2.5.Final","3.2.6.Final","3.2.7.Final","3.2.8.Final","3.2.9.Final"],"database_specific":{"last_known_affected_version_range":"< 4.0.0","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/03/GHSA-f256-j965-7f32/GHSA-f256-j965-7f32.json"}},{"package":{"name":"io.netty:netty","ecosystem":"Maven","purl":"pkg:maven/io.netty/netty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.10.0.Final","3.10.1.Final","3.10.2.Final","3.10.3.Final","3.10.4.Final","3.10.5.Final","3.10.6.Final","3.3.0.Final","3.3.1.Final","3.4.0.Alpha1","3.4.0.Alpha2","3.4.0.Beta1","3.4.0.Final","3.4.1.Final","3.4.2.Final","3.4.3.Final","3.4.4.Final","3.4.5.Final","3.4.6.Final","3.5.0.Beta1","3.5.0.Final","3.5.1.Final","3.5.10.Final","3.5.11.Final","3.5.12.Final","3.5.13.Final","3.5.2.Final","3.5.3.Final","3.5.4.Final","3.5.5.Final","3.5.6.Final","3.5.7.Final","3.5.8.Final","3.5.9.Final","3.6.0.Beta1","3.6.0.Final","3.6.1.Final","3.6.10.Final","3.6.2.Final","3.6.3.Final","3.6.4.Final","3.6.5.Final","3.6.6.Final","3.6.7.Final","3.6.8.Final","3.6.9.Final","3.7.0.Final","3.7.1.Final","3.8.0.Final","3.8.1.Final","3.8.2.Final","3.8.3.Final","3.9.0.Final","3.9.1.1.Final","3.9.1.Final","3.9.2.Final","3.9.3.Final","3.9.4.Final","3.9.5.Final","3.9.6.Final","3.9.7.Final","3.9.8.Final","3.9.9.Final","4.0.0.Alpha1","4.0.0.Alpha2","4.0.0.Alpha3","4.0.0.Alpha4","4.0.0.Alpha5","4.0.0.Alpha6","4.0.0.Alpha7","4.0.0.Alpha8"],"database_specific":{"last_known_affected_version_range":"< 4.0.0","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/03/GHSA-f256-j965-7f32/GHSA-f256-j965-7f32.json"}}],"references":[{"type":"WEB","url":"https://github.com/netty/netty/security/advisories/GHSA-f256-j965-7f32"},{"type":"WEB","url":"https://github.com/netty/netty/security/advisories/GHSA-wm47-8v5p-wjpj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21409"},{"type":"WEB","url":"https://github.com/netty/netty/commit/b0fa4d5aab4215f3c22ce6123dd8dd5f38dc0432"},{"type":"WEB","url":"https://lists.apache.org/thread.html/re39391adcb863f0e9f3f15e7986255948f263f02e4700b82453e7102@%3Cissues.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/re1911e05c08f3ec2bab85744d788773519a0afb27272a31ac2a0b4e8@%3Cnotifications.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rdd5715f3ee5e3216d5e0083a07994f67da6dbb9731ce9e7a6389b18e@%3Ccommits.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rdd206d9dd7eb894cc089b37fe6edde2932de88d63a6d8368b44f5101@%3Ccommits.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rd8f72411fb75b98d366400ae789966373b5c3eb3f511e717caf3e49e@%3Cissues.flink.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rd4a6b7dec38ea6cd28b6f94bd4b312629a52b80be3786d5fb0e474bc@%3Cissues.kudu.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rcae42fba06979934208bbd515584b241d3ad01d1bb8b063512644362@%3Cdev.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rca0978b634a0c3ebee4126ec29c7f570b165fae3f8f3658754c1cbd3@%3Cissues.kudu.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rbde2f13daf4911504f0eaea43eee4f42555241b5f6d9d71564b6c5fa@%3Cjira.kafka.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rba2a9ef1d0af882ab58fadb336a58818495245dda43d32a7d7837187@%3Cissues.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rafc77f9f03031297394f3d372ccea751b23576f8a2ae9b6b053894c5@%3Cissues.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rac8cf45a1bab9ead5c9a860cbadd6faaeb7792203617b6ec3874736d@%3Cissues.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/raa413040db6d2197593cc03edecfd168732e697119e6447b0a25d525@%3Cissues.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/ra66e93703e3f4bd31bdfd0b6fb0c32ae96b528259bb1aa2b6d38e401@%3Cissues.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/re4b0141939370304d676fe23774d0c6fbc584b648919825402d0cb39@%3Cnotifications.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/re7c69756a102bebce8b8681882844a53e2f23975a189363e68ad0324@%3Cissues.flink.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/re9e6ed60941da831675de2f8f733c026757fb4fa28a7b6c9f3dfb575@%3Cdev.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/redef0fb5474fd686781007de9ddb852b24f1b04131a248d9a4789183@%3Cnotifications.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rf148b2bf6c2754153a8629bc7495e216bd0bd4c915695486542a10b4@%3Cnotifications.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rf38e4dcdefc7c59f7ba0799a399d6d6e37b555d406a1dfc2fcbf0b35@%3Ccommits.pulsar.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rf521ff2be2e2dd38984174d3451e6ee935c845948845c8fccd86371d@%3Cissues.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/rf934292a4a1c189827f625d567838d2c1001e4739b158638d844105b@%3Cissues.kudu.apache.org%3E"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20210604-0003"},{"type":"WEB","url":"https://www.debian.org/security/2021/dsa-4885"},{"type":"WEB","url":"https://www.oracle.com//security-alerts/cpujul2021.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpuoct2021.html"},{"type":"WEB","url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21295"},{"type":"PACKAGE","url":"https://github.com/netty/netty"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r0b09f3e31e004fe583f677f7afa46bd30110904576c13c5ac818ac2c@%3Cissues.flink.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r0ca82fec33334e571fe5b388272260778883e307e15415d7b1443de2@%3Cissues.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r101f82d8f3b5af0bf79aecbd5b2dd3b404f6bb51d1a54c2c3d29bed9@%3Cnotifications.zookeeper.apache.org%3E"},{"type":"WEB","url":"https://lists.apache.org/thread.html/r1b3cb0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