{"id":"CVE-2021-21409","title":"Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients","summary":"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 i…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","cwe":["CWE-444","CWE-444"],"vendor":"netty","product":"netty","affected":["netty < 4.1.61","debian_linux = 10.0","oncommand_api_services","oncommand_workflow_automation","banking_corporate_lending_process_management = 14.2.0","banking_corporate_lending_process_management = 14.3.0","banking_corporate_lending_process_management = 14.5.0","banking_credit_facilities_process_management = 14.2.0","banking_credit_facilities_process_management = 14.3.0","banking_credit_facilities_process_management = 14.5.0","banking_trade_finance_process_management = 14.2.0","banking_trade_finance_process_management = 14.3.0","banking_trade_finance_process_management = 14.5.0","coherence = 12.2.1.4.0","coherence = 14.1.1.0.0","communications_brm_-_elastic_charging_engine = 12.0.0.3","communications_cloud_native_core_console = 1.7.0","communications_cloud_native_core_policy = 1.14.0","communications_design_studio = 7.4.2.0.0","communications_messaging_server = 8.1","helidon = 1.4.10","helidon = 2.4.0","jd_edwards_enterpriseone_tools < 9.2.6.3","nosql_database < 21.1.12","primavera_gateway >= 17.12.0, <= 17.12.11","primavera_gateway >= 18.8.0, <= 18.8.11","primavera_gateway >= 19.12.0, <= 19.12.10","quarkus <= 1.13.7"],"patched":["netty 4.1.61","jd_edwards_enterpriseone_tools 9.2.6.3","nosql_database 21.1.12"],"published":"2021-03-30","updated":"2026-10-08","sourceUpdated":"2026-10-08T22:17:06.500","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-21409","references":[{"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21295","label":"security-advisories@github.com"},{"url":"https://github.com/netty/netty/commit/b0fa4d5aab4215f3c22ce6123dd8dd5f38dc0432","label":"security-advisories@github.com"},{"url":"https://github.com/netty/netty/security/advisories/GHSA-f256-j965-7f32","label":"security-advisories@github.com"},{"url":"https://github.com/netty/netty/security/advisories/GHSA-wm47-8v5p-wjpj","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r0b09f3e31e004fe583f677f7afa46bd30110904576c13c5ac818ac2c%40%3Cissues.flink.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r0ca82fec33334e571fe5b388272260778883e307e15415d7b1443de2%40%3Cissues.zookeeper.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r101f82d8f3b5af0bf79aecbd5b2dd3b404f6bb51d1a54c2c3d29bed9%40%3Cnotifications.zookeeper.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r1b3cb056364794f919aaf26ceaf7423de64e7fdd05a914066e7d5219%40%3Cissues.zookeeper.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r2732aa3884cacfecac4c54cfaa77c279ba815cad44b464a567216f83%40%3Cissues.zookeeper.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r31044fb995e894749cb821c6fe56f487c16a97028e6e360e59f09d58%40%3Cissues.zookeeper.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r4a98827bb4a7edbd69ef862f2351391845697c40711820d10df52ca5%40%3Ccommits.zookeeper.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r4b8be87acf5b9c098a2ee350b5ca5716fe7afeaf0a21a4ee45a90687%40%3Cissues.zookeeper.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r4ea2f1a9d79d4fc1896e085f31fb60a21b1770d0a26a5250f849372d%40%3Cissues.kudu.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r584cf871f188c406d8bd447ff4e2fd9817fca862436c064d0951a071%40%3Ccommits.pulsar.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r5baac01f9e06c40ff7aab209d5751b3b58802c63734e33324b70a06a%40%3Cissues.flink.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r5cbea8614812289a9b98d0cfc54b47f54cef424ac98d5e315b791795%40%3Cnotifications.zookeeper.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r5f2f120b2b8d099226473db1832ffb4d7c1d6dc2d228a164bf293a8e%40%3Cissues.zookeeper.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r602e98daacc98934f097f07f2eed6eb07c18bfc1949c8489dc7bfcf5%40%3Cissues.flink.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r61564d86a75403b854cdafee67fc69c8b88c5f6802c2c838f4282cc8%40%3Ccommits.pulsar.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r69efd8ef003f612c43e4154e788ca3b1f837feaacd16d97854402355%40%3Ccommits.zookeeper.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r6dac9bd799ceac499c7a7e152a9b0dc7f2fe7f89ec5605d129bb047b%40%3Cissues.zookeeper.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r70c3a7bfa904f06a1902f4df20ee26e4f09a46b8fd3eb304dc57a2de%40%3Cdev.zookeeper.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r7879ddcb990c835c6b246654770d836f9d031dee982be836744e50ed%40%3Ccommits.pulsar.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r7b54563abebe3dbbe421e1ba075c2030d8d460372f8c79b7789684b6%40%3Cissues.zookeeper.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r823d4b27fcba8dad5fe945bdefce3ca5a0031187966eb6ef3cc22ba9%40%3Cissues.zookeeper.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r855b4b6814ac829ce2d48dd9d8138d07f33387e710de798ee92c011e%40%3Cissues.flink.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r967002f0939e69bdec58f070735a19dd57c1f2b8f817949ca17cddae%40%3Cissues.zookeeper.apache.org%3E","label":"security-advisories@github.com"},{"url":"https://lists.apache.org/thread.html/r9ec78dc409f3f1edff88f21cab53737f36aad46f582a9825389092e0%40%3Cissues.zookeeper.apache.org%3E","label":"s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"url":"https://www.debian.org/security/2021/dsa-4885","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com//security-alerts/cpujul2021.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpuapr2022.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpujan2022.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpuoct2021.html","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.04935,"epssPercentile":0.91922,"ingestedAt":"2026-10-08T23:16:47.317Z","slug":"CVE-2021-21409","body":"## Overview\n\nNetty 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.\n\n## Affected\n\n- `netty < 4.1.61`\n- `debian_linux = 10.0`\n- `oncommand_api_services`\n- `oncommand_workflow_automation`\n- `banking_corporate_lending_process_management = 14.2.0`\n- `banking_corporate_lending_process_management = 14.3.0`\n- `banking_corporate_lending_process_management = 14.5.0`\n- `banking_credit_facilities_process_management = 14.2.0`\n- `banking_credit_facilities_process_management = 14.3.0`\n- `banking_credit_facilities_process_management = 14.5.0`\n- `banking_trade_finance_process_management = 14.2.0`\n- `banking_trade_finance_process_management = 14.3.0`\n- `banking_trade_finance_process_management = 14.5.0`\n- `coherence = 12.2.1.4.0`\n- `coherence = 14.1.1.0.0`\n- `communications_brm_-_elastic_charging_engine = 12.0.0.3`\n- `communications_cloud_native_core_console = 1.7.0`\n- `communications_cloud_native_core_policy = 1.14.0`\n- `communications_design_studio = 7.4.2.0.0`\n- `communications_messaging_server = 8.1`\n- `helidon = 1.4.10`\n- `helidon = 2.4.0`\n- `jd_edwards_enterpriseone_tools < 9.2.6.3`\n- `nosql_database < 21.1.12`\n- `primavera_gateway >= 17.12.0, <= 17.12.11`\n- `primavera_gateway >= 18.8.0, <= 18.8.11`\n- `primavera_gateway >= 19.12.0, <= 19.12.10`\n- `quarkus <= 1.13.7`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `netty 4.1.61`\n- `jd_edwards_enterpriseone_tools 9.2.6.3`\n- `nosql_database 21.1.12`","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":1,"exploitation":0,"ransomware":0},"changes":[]}