{"schema_version":"1.7.5","id":"GHSA-wx5j-54mm-rqqq","published":"2021-12-09T19:09:17Z","modified":"2026-07-08T06:27:16.788959198Z","aliases":["CVE-2021-43797"],"related":["CGA-9pj8-4gmp-wp6g"],"summary":"HTTP request smuggling in netty","details":"### Impact\n\nNetty currently just skips control chars when these are present at the beginning / end of the header name. We should better fail fast as these are not allowed by the spec and could lead to HTTP request smuggling.\n\nFailing to do the validation might cause netty to \"sanitize\" header names before it forward these to another remote system when used as proxy. This remote system can't see the invalid usage anymore and so not do the validation itself.\n\n","affected":[{"package":{"name":"io.netty:netty-codec-http","ecosystem":"Maven","purl":"pkg:maven/io.netty/netty-codec-http"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"4.1.71.Final"}]}],"versions":["4.0.0.Final","4.0.1.Final","4.0.10.Final","4.0.11.Final","4.0.12.Final","4.0.13.Final","4.0.14.Beta1","4.0.14.Final","4.0.15.Final","4.0.16.Final","4.0.17.Final","4.0.18.Final","4.0.19.Final","4.0.2.Final","4.0.20.Final","4.0.21.Final","4.0.22.Final","4.0.23.Final","4.0.24.Final","4.0.25.Final","4.0.26.Final","4.0.27.Final","4.0.28.Final","4.0.29.Final","4.0.3.Final","4.0.30.Final","4.0.31.Final","4.0.32.Final","4.0.33.Final","4.0.34.Final","4.0.35.Final","4.0.36.Final","4.0.37.Final","4.0.38.Final","4.0.39.Final","4.0.4.Final","4.0.40.Final","4.0.41.Final","4.0.42.Final","4.0.43.Final","4.0.44.Final","4.0.45.Final","4.0.46.Final","4.0.47.Final","4.0.48.Final","4.0.49.Final","4.0.5.Final","4.0.50.Final","4.0.51.Final","4.0.52.Final","4.0.53.Final","4.0.54.Final","4.0.55.Final","4.0.56.Final","4.0.6.Final","4.0.7.Final","4.0.8.Final","4.0.9.Final","4.1.0.Beta1","4.1.0.Beta2","4.1.0.Beta3","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","4.1.61.Final","4.1.62.Final","4.1.63.Final","4.1.64.Final","4.1.65.Final","4.1.66.Final","4.1.67.Final","4.1.68.Final","4.1.69.Final","4.1.7.Final","4.1.70.Final","4.1.8.Final","4.1.9.Final"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/12/GHSA-wx5j-54mm-rqqq/GHSA-wx5j-54mm-rqqq.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/2021/12/GHSA-wx5j-54mm-rqqq/GHSA-wx5j-54mm-rqqq.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/2021/12/GHSA-wx5j-54mm-rqqq/GHSA-wx5j-54mm-rqqq.json"}}],"references":[{"type":"WEB","url":"https://github.com/netty/netty/security/advisories/GHSA-wx5j-54mm-rqqq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43797"},{"type":"WEB","url":"https://github.com/netty/netty/pull/11891"},{"type":"WEB","url":"https://github.com/netty/netty/commit/07aa6b5938a8b6ed7a6586e066400e2643897323"},{"type":"WEB","url":"https://github.com/netty/netty"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2023/01/msg00008.html"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20220107-0003"},{"type":"WEB","url":"https://www.debian.org/security/2023/dsa-5316"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujul2022.html"}],"database_specific":{"cwe_ids":["CWE-444"],"github_reviewed":true,"github_reviewed_at":"2021-12-09T18:17:28Z","nvd_published_at":"2021-12-09T19:15:00Z","severity":"MODERATE"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N"}]}