{"answers":{"affected":"6 open source packages ship an affected version, including io.netty:netty, io.netty:netty-codec-http and org.jboss.netty:netty. It affects 18 products.","exploited":"There is no known exploitation of CVE-2021-43797 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2021-43797 is a medium-severity vulnerability in Debian Debian Linux, published on 9 Dec 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-43797 and fix it if it is affected.\n\nWhat it is: CVE-2021-43797 is a medium-severity vulnerability in Debian Debian Linux, published on 9 Dec 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2021-43797 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- io.netty:netty (Maven): affected all versions; no fix listed\n- io.netty:netty (Maven): affected all versions; no fix listed\n- io.netty:netty-codec-http (Maven): affected from 4.0.0; fixed in 4.1.71.Final\n- io.netty:netty-codec-http (Maven): affected from 4.0.0; fixed in 4.1.71.Final\n- org.jboss.netty:netty (Maven): affected all versions; no fix listed\n- org.jboss.netty:netty (Maven): affected all versions; no fix listed\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-43797/ (Markdown: https://insights.sbomify.com/CVE-2021-43797/index.md)","id":"CVE-2021-43797","markdown":"https://insights.sbomify.com/CVE-2021-43797/index.md","name":"CVE-2021-43797","record":{"aliases":["CLEANSTART-2026-HO82916","CLEANSTART-2026-OX13764","CLSA-2026-1793139574","DEBIAN-CVE-2021-43797","GHSA-wx5j-54mm-rqqq","OESA-2021-1472","OESA-2022-1930","SUSE-SU-2022:2047-1","UBUNTU-CVE-2021-43797","openSUSE-SU-2024:11743-1","openSUSE-SU-2024:11981-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Netty network framework","requires_auth":"none","summary":"Netty fails to validate control characters in HTTP header names, allowing HTTP request smuggling when used as a proxy.","user_interaction":"required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"oncommand_workflow_automation","vendor":"netapp"},{"product":"snapcenter","vendor":"netapp"},{"product":"netty","vendor":"netty"},{"product":"banking_deposits_and_lines_of_credit_servicing","vendor":"oracle"},{"product":"banking_party_management","vendor":"oracle"},{"product":"banking_platform","vendor":"oracle"},{"product":"coherence","vendor":"oracle"},{"product":"communications_cloud_native_core_binding_support_function","vendor":"oracle"},{"product":"communications_cloud_native_core_network_slice_selection_function","vendor":"oracle"},{"product":"communications_cloud_native_core_policy","vendor":"oracle"},{"product":"communications_cloud_native_core_security_edge_protection_proxy","vendor":"oracle"},{"product":"communications_cloud_native_core_unified_data_repository","vendor":"oracle"},{"product":"communications_design_studio","vendor":"oracle"},{"product":"communications_instant_messaging_server","vendor":"oracle"},{"product":"helidon","vendor":"oracle"},{"product":"peoplesoft_enterprise_peopletools","vendor":"oracle"},{"product":"quarkus","vendor":"quarkus"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-444","name":"Inconsistent Interpretation of HTTP Requests"}],"description":"Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers \u0026 clients. Netty prior to version 4.1.71.Final skips control chars when they are present at the beginning / end of the header name. It should instead fail fast as these are not allowed by the spec and could lead to HTTP request smuggling. Failing 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 therefore does not do the validation itself. Users should upgrade to version 4.1.71.Final.","ecosystems":["Maven","SUSE:Linux Enterprise Module for Development Tools 15 SP3","SUSE:Linux Enterprise Module for Development Tools 15 SP4","openSUSE:Leap 15.3","openSUSE:Leap 15.4","openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"HTTP fails to validate against control chars in header names which may lead to HTTP request smuggling","id":"CVE-2021-43797","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Maven","product":"debian:debian_linux","products":["debian:debian_linux","netapp:oncommand_workflow_automation","netapp:snapcenter","netty:netty","oracle:banking_platform","oracle:coherence","oracle:communications_cloud_native_core_binding_support_function","oracle:communications_cloud_native_core_policy","oracle:communications_instant_messaging_server","oracle:helidon","oracle:peoplesoft_enterprise_peopletools"],"type":"other","year":"2021"},"n_packages":12,"n_references":7,"next":{"headline":"Grafana Path Traversal","id":"CVE-2021-43798"},"packages":[{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":[],"package":"io.netty:netty","purl":null,"source":"GHSA-wx5j-54mm-rqqq"},{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":[],"package":"io.netty:netty","purl":"pkg:maven/io.netty/netty","source":"GHSA-wx5j-54mm-rqqq"},{"ecosystem":"Maven","fixed":["4.1.71.Final"],"introduced":["4.0.0"],"last_affected":[],"package":"io.netty:netty-codec-http","purl":null,"source":"GHSA-wx5j-54mm-rqqq"},{"ecosystem":"Maven","fixed":["4.1.71.Final"],"introduced":["4.0.0"],"last_affected":[],"package":"io.netty:netty-codec-http","purl":"pkg:maven/io.netty/netty-codec-http","source":"GHSA-wx5j-54mm-rqqq"},{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":[],"package":"org.jboss.netty:netty","purl":null,"source":"GHSA-wx5j-54mm-rqqq"},{"ecosystem":"Maven","fixed":[],"introduced":["0"],"last_affected":[],"package":"org.jboss.netty:netty","purl":"pkg:maven/org.jboss.netty/netty","source":"GHSA-wx5j-54mm-rqqq"},{"ecosystem":"SUSE:Linux Enterprise Module for Development Tools 15 SP3","fixed":["3.10.6-150200.3.3.2"],"introduced":["0"],"last_affected":[],"package":"netty3","purl":"pkg:rpm/suse/netty3\u0026distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP3","source":"SUSE-SU-2022:2047-1"},{"ecosystem":"SUSE:Linux Enterprise Module for Development Tools 15 SP4","fixed":["3.10.6-150200.3.3.2"],"introduced":["0"],"last_affected":[],"package":"netty3","purl":"pkg:rpm/suse/netty3\u0026distro=SUSE%20Linux%20Enterprise%20Module%20for%20Development%20Tools%2015%20SP4","source":"SUSE-SU-2022:2047-1"},{"ecosystem":"openSUSE:Leap 15.3","fixed":["3.10.6-150200.3.3.2"],"introduced":["0"],"last_affected":[],"package":"netty3","purl":"pkg:rpm/opensuse/netty3\u0026distro=openSUSE%20Leap%2015.3","source":"SUSE-SU-2022:2047-1"},{"ecosystem":"openSUSE:Leap 15.4","fixed":["3.10.6-150200.3.3.2"],"introduced":["0"],"last_affected":[],"package":"netty3","purl":"pkg:rpm/opensuse/netty3\u0026distro=openSUSE%20Leap%2015.4","source":"SUSE-SU-2022:2047-1"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["4.1.72-1.1"],"introduced":["0"],"last_affected":[],"package":"netty","purl":"pkg:rpm/opensuse/netty\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2024:11743-1"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["3.10.6-9.1"],"introduced":["0"],"last_affected":[],"package":"netty3","purl":"pkg:rpm/opensuse/netty3\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2024:11981-1"}],"prev":{"headline":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in com.linecorp.armeria:armeria","id":"CVE-2021-43795"},"products":["netty"],"published":"2021-12-09","related":[{"cvss_score":10,"headline":"ProFTPD Improper Access Control","id":"CVE-2015-3306","kev_date_added":"2026-10-08","published":"2015-05-18"},{"cvss_score":9.9,"headline":"RoundCube Webmail Deserialization of Untrusted Data","id":"CVE-2025-49113","kev_date_added":"2026-02-20","published":"2025-06-02"},{"cvss_score":9.8,"headline":"GNU InetUtils Argument Injection","id":"CVE-2026-24061","kev_date_added":"2026-01-26","published":"2026-01-21"},{"cvss_score":9.8,"headline":"Linux Kernel Improper Check for Unusual or Exceptional Conditions","id":"CVE-2025-39682","kev_date_added":"2026-09-18","published":"2025-09-05"},{"cvss_score":9.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2024-9680","kev_date_added":"2024-10-15","published":"2024-10-09"},{"cvss_score":9.8,"headline":"RARLAB UnRAR Directory Traversal","id":"CVE-2022-30333","kev_date_added":"2022-08-09","published":"2022-05-09"},{"cvss_score":9.8,"headline":"Roundcube Webmail SQL Injection","id":"CVE-2021-44026","kev_date_added":"2023-06-22","published":"2021-11-19"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"SUSE"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-08","vendors":["netty"]},"summary":"Netty fails to validate control characters in HTTP header names, allowing HTTP request smuggling when used as a proxy.","url":"https://insights.sbomify.com/CVE-2021-43797/"}