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Security advisory

Type: advisorySources: OSVCVE: CVE-2021-21409

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 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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2021-21409
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 09:19 UTC · Revision 1

Source evidence

CVE-2021-21409

core-osv · Original source

Published 30 Mar 2021, 15:15 UTC

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 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.

osv:CVE-2021-21409
Complete source record
{
  "id": "436153f865d9307453174e7ad34d3bdf2bafa902ec63b0f1623c7ca4ccdcecc6",
  "url": "https://osv.dev/vulnerability/CVE-2021-21409",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-21409",
    "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 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.",
    "evidence": "osv:CVE-2021-21409",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-21409",
      "aliases": [
        "CVE-2021-21409",
        "GHSA-f256-j965-7f32"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"
        }
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21409.json",
            "vanir_signatures": [
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                "id": "CVE-2021-21409-2dd43cd2",
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      "modified": "2026-10-24T14:12:12.021060949Z",
      "provider": "osv",
      "references": [
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        "https://lists.apache.org/thread.html/re7c69756a102bebce8b8681882844a53e2f23975a189363e68ad0324%40%3Cissues.flink.apache.org%3E",
        "https://lists.apache.org/thread.html/re9e6ed60941da831675de2f8f733c026757fb4fa28a7b6c9f3dfb575%40%3Cdev.zookeeper.apache.org%3E",
        "https://lists.apache.org/thread.html/redef0fb5474fd686781007de9ddb852b24f1b04131a248d9a4789183%40%3Cnotifications.zookeeper.apache.org%3E",
        "https://lists.apache.org/thread.html/rf148b2bf6c2754153a8629bc7495e216bd0bd4c915695486542a10b4%40%3Cnotifications.zookeeper.apache.org%3E",
        "https://lists.apache.org/thread.html/rf38e4dcdefc7c59f7ba0799a399d6d6e37b555d406a1dfc2fcbf0b35%40%3Ccommits.pulsar.apache.org%3E",
        "https://lists.apache.org/thread.html/rf521ff2be2e2dd38984174d3451e6ee935c845948845c8fccd86371d%40%3Cissues.zookeeper.apache.org%3E",
        "https://lists.apache.org/thread.html/rf934292a4a1c189827f625d567838d2c1001e4739b158638d844105b%40%3Cissues.kudu.apache.org%3E",
        "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21295",
        "https://github.com/netty/netty/security/advisories/GHSA-f256-j965-7f32",
        "https://github.com/netty/netty/security/advisories/GHSA-wm47-8v5p-wjpj",
        "https://security.netapp.com/advisory/ntap-20210604-0003/",
        "https://www.debian.org/security/2021/dsa-4885",
        "https://github.com/netty/netty/commit/b0fa4d5aab4215f3c22ce6123dd8dd5f38dc0432",
        "https://www.oracle.com//security-alerts/cpujul2021.html",
        "https://www.oracle.com/security-alerts/cpuapr2022.html",
        "https://www.oracle.com/security-alerts/cpujan2022.html",
        "https://www.oracle.com/security-alerts/cpuoct2021.html"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
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            "cpes": [
              "cpe:2.3:a:oracle:jd_edwards_enterpriseone_tools:*:*:*:*:*:*:*:*"
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                    "fixed": "9.2.6.3"
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                "source": "CPE_RANGE"
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                "source": "CPE_RANGE"
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                "range": [
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                    "introduced": "17.12.0"
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                    "last_affected": "17.12.11"
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                    "introduced": "18.8.0"
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                  {
                    "last_affected": "18.8.11"
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                    "introduced": "19.12.0"
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                    "last_affected": "19.12.10"
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                ],
                "source": "CPE_RANGE"
              }
            ]
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          {
            "cpes": [
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            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
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                    "introduced": "10.0"
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                  {
                    "last_affected": "10.0"
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                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:oracle:banking_corporate_lending_process_management:14.2.0:*:*:*:*:*:*:*",
              "cpe:2.3:a:oracle:banking_corporate_lending_process_management:14.3.0:*:*:*:*:*:*:*",
              "cpe:2.3:a:oracle:banking_corporate_lending_process_management:14.5.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "oracle:banking_corporate_lending_process_management",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "14.2.0"
                  },
                  {
                    "last_affected": "14.2.0"
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                  {
                    "introduced": "14.3.0"
                  },
                  {
                    "last_affected": "14.3.0"
                  },
                  {
                    "introduced": "14.5.0"
                  },
                  {
                    "last_affected": "14.5.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:oracle:banking_credit_facilities_process_management:14.2.0:*:*:*:*:*:*:*",
              "cpe:2.3:a:oracle:banking_credit_facilities_process_management:14.3.0:*:*:*:*:*:*:*",
              "cpe:2.3:a:oracle:banking_credit_facilities_process_management:14.5.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "oracle:banking_credit_facilities_process_management",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "14.2.0"
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                  {
                    "last_affected": "14.2.0"
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                  {
                    "introduced": "14.3.0"
                  },
                  {
                    "last_affected": "14.3.0"
                  },
                  {
                    "introduced": "14.5.0"
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                  {
                    "last_affected": "14.5.0"
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                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
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              "cpe:2.3:a:oracle:banking_trade_finance_process_management:14.3.0:*:*:*:*:*:*:*",
              "cpe:2.3:a:oracle:banking_trade_finance_process_management:14.5.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "oracle:banking_trade_finance_process_management",
            "extracted_events": [
              {
                "range": [
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                    "introduced": "14.2.0"
                  },
                  {
                    "last_affected": "14.2.0"
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                  {
                    "introduced": "14.3.0"
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                  {
                    "last_affected": "14.3.0"
                  },
                  {
                    "introduced": "14.5.0"
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                  {
                    "last_affected": "14.5.0"
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                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:oracle:coherence:12.2.1.4.0:*:*:*:*:*:*:*",
              "cpe:2.3:a:oracle:coherence:14.1.1.0.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "oracle:coherence",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "12.2.1.4.0"
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                  {
                    "last_affected": "12.2.1.4.0"
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                  {
                    "introduced": "14.1.1.0.0"
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                  {
                    "last_affected": "14.1.1.0.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:oracle:communications_brm_-_elastic_charging_engine:12.0.0.3:*:*:*:*:*:*:*"
            ],
            "vendor_product": "oracle:communications_brm_-_elastic_charging_engine",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "12.0.0.3"
                  },
                  {
                    "last_affected": "12.0.0.3"
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                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:oracle:communications_cloud_native_core_console:1.7.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "oracle:communications_cloud_native_core_console",
            "extracted_events": [
              {
                "range": [
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                    "introduced": "1.7.0"
                  },
                  {
                    "last_affected": "1.7.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:oracle:communications_cloud_native_core_policy:1.14.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "oracle:communications_cloud_native_core_policy",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "1.14.0"
                  },
                  {
                    "last_affected": "1.14.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:oracle:communications_design_studio:7.4.2.0.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "oracle:communications_design_studio",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "7.4.2.0.0"
                  },
                  {
                    "last_affected": "7.4.2.0.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:oracle:communications_messaging_server:8.1:*:*:*:*:*:*:*"
            ],
            "vendor_product": "oracle:communications_messaging_server",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "8.1"
                  },
                  {
                    "last_affected": "8.1"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-21409",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 443361,
  "published_at": "2021-03-30T15:15:14.573+00:00"
}