CVE catalog

CVE-2021-21409

Netty is an open-source, asynchronous event-driven…

[CVE catalog]

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.

Severity
Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Published
Updated
Source
[NVD] · [CVE record]
EPSS
4.93% · Oct 27, 2026

Projects and upstream resources

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / releasePackageVersionStatusSource
Debiantrixie-securitynetty1:4.1.48-10+deb13u1Fixed[CVE-2021-21409]
Debiantrixienetty1:4.1.48-10+deb13u1Fixed[CVE-2021-21409]
Debiantrixienetty1:4.1.48-4FixedDistribution-reported fixed boundary[CVE-2021-21409]
Debiansidnetty1:4.1.48-16Fixed[CVE-2021-21409]
Debiansidnetty1:4.1.48-4FixedDistribution-reported fixed boundary[CVE-2021-21409]
Debianforkynetty1:4.1.48-16Fixed[CVE-2021-21409]
Debianforkynetty1:4.1.48-4FixedDistribution-reported fixed boundary[CVE-2021-21409]
Debianbookworm-securitynetty1:4.1.48-7+deb12u2Fixed[CVE-2021-21409]
Debianbookwormnetty1:4.1.48-4FixedDistribution-reported fixed boundary[CVE-2021-21409]
Debianbookwormnetty1:4.1.48-7+deb12u2Fixed[CVE-2021-21409]

Showing 10 fix observations. All 19 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence
Distribution / releasePackageVersionStatusSource
Debianbookwormnetty1:4.1.48-4FixedDistribution-reported fixed boundary[CVE-2021-21409]
Debianbookwormnetty1:4.1.48-7+deb12u2Fixed[CVE-2021-21409]
Debianbookworm-securitynetty1:4.1.48-7+deb12u2Fixed[CVE-2021-21409]
Debianforkynetty1:4.1.48-16Fixed[CVE-2021-21409]
Debianforkynetty1:4.1.48-4FixedDistribution-reported fixed boundary[CVE-2021-21409]
Debiansidnetty1:4.1.48-16Fixed[CVE-2021-21409]
Debiansidnetty1:4.1.48-4FixedDistribution-reported fixed boundary[CVE-2021-21409]
Debiantrixienetty1:4.1.48-10+deb13u1Fixed[CVE-2021-21409]
Debiantrixienetty1:4.1.48-4FixedDistribution-reported fixed boundary[CVE-2021-21409]
Debiantrixie-securitynetty1:4.1.48-10+deb13u1Fixed[CVE-2021-21409]
Opensuseleap 15.3netty4.1.75-150200.4.9.1UnknownSource applicability is not established[SUSE-SU-2022:1315-1]
Opensusetumbleweednetty4.1.114-1.1UnknownSource applicability is not established[OPENSUSE-SU-2024:14442-1]
Ubuntu22.04netty1:4.1.48-4UnknownSource applicability is not established[UBUNTU-CVE-2021-21409]
Ubuntu22.04netty1:4.1.48-4+deb11u1build0.22.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-21409]
Ubuntupronetty1:4.1.33-1UnknownSource applicability is not established[UBUNTU-CVE-2021-21409]
Ubuntupronetty1:4.1.33-2UnknownSource applicability is not established[UBUNTU-CVE-2021-21409]
Ubuntupronetty1:4.1.33-3UnknownSource applicability is not established[UBUNTU-CVE-2021-21409]
Ubuntupronetty1:4.1.45-1UnknownSource applicability is not established[UBUNTU-CVE-2021-21409]
Ubuntupronetty1:4.1.45-1ubuntu0.1~esm1UnknownSource applicability is not established[UBUNTU-CVE-2021-21409]
Original provider fields
{
  "package_releases": [
    {
      "name": "netty",
      "status": "fixed",
      "release": "sid",
      "version": "1:4.1.48-16"
    },
    {
      "name": "netty",
      "status": "fixed",
      "release": "forky",
      "version": "1:4.1.48-16"
    },
    {
      "name": "netty",
      "status": "fixed",
      "release": "trixie",
      "version": "1:4.1.48-10+deb13u1"
    },
    {
      "name": "netty",
      "status": "fixed",
      "release": "trixie-security",
      "version": "1:4.1.48-10+deb13u1"
    },
    {
      "name": "netty",
      "status": "fixed",
      "release": "bookworm",
      "version": "1:4.1.48-7+deb12u2"
    },
    {
      "name": "netty",
      "status": "fixed",
      "release": "bookworm-security",
      "version": "1:4.1.48-7+deb12u2"
    }
  ],
  "fixed_versions": [
    {
      "bug": 986217,
      "name": "netty",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "1:4.1.48-4"
    },
    {
      "bug": 986217,
      "name": "netty",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "1:4.1.48-4"
    },
    {
      "bug": 986217,
      "name": "netty",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "1:4.1.48-4"
    },
    {
      "bug": 986217,
      "name": "netty",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "1:4.1.48-4"
    }
  ],
  "distribution_packages": [
    {
      "name": "netty",
      "ranges": [
        {
          "fixed": "4.1.61",
          "introduced": "",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "4.1.61",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "debian_linux",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "oncommand_api_services",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "oncommand_workflow_automation",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "banking_corporate_lending_process_management",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "banking_corporate_lending_process_management",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "banking_corporate_lending_process_management",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "banking_credit_facilities_process_management",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "banking_credit_facilities_process_management",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "banking_credit_facilities_process_management",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "banking_trade_finance_process_management",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "banking_trade_finance_process_management",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "banking_trade_finance_process_management",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "coherence",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "coherence",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "communications_brm_-_elastic_charging_engine",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "communications_cloud_native_core_console",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "communications_cloud_native_core_policy",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "communications_design_studio",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "communications_messaging_server",
      "ranges": [],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21409",
      "fixed_version": "",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2021-21409",
      "provider_updated_at": "2026-10-08T22:17:06.500"
    },
    {
      "name": "netty",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:4.1.45-1ubuntu0.1~esm1"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "1:4.1.33-1",
        "1:4.1.33-2",
        "1:4.1.33-3",
        "1:4.1.45-1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-21409",
      "fixed_version": "1:4.1.45-1ubuntu0.1~esm1",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2021-21409",
      "provider_updated_at": "2026-06-08T18:50:38.543645705Z",
      "applicability_unknown": true
    },
    {
      "name": "netty",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:4.1.48-4+deb11u1build0.22.04.1"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "1:4.1.48-4"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-21409",
      "fixed_version": "1:4.1.48-4+deb11u1build0.22.04.1",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2021-21409",
      "provider_updated_at": "2026-06-08T18:50:38.543645705Z",
      "applicability_unknown": true
    },
    {
      "name": "netty",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.114-1.1"
            }
          ]
        }
      ],
      "release": "tumbleweed",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/openSUSE-SU-2024:14442-1",
      "fixed_version": "4.1.114-1.1",
      "provider_source": "pypi",
      "provider_record_id": "OPENSUSE-SU-2024:14442-1",
      "provider_updated_at": "2025-05-07T18:12:26.568518Z",
      "applicability_unknown": true
    },
    {
      "name": "netty",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.75-150200.4.9.1"
            }
          ]
        }
      ],
      "release": "leap 15.3",
      "versions": [],
      "ecosystem": "rpm",
      "provider_url": "https://osv.dev/vulnerability/SUSE-SU-2022:1315-1",
      "fixed_version": "4.1.75-150200.4.9.1",
      "provider_source": "pypi",
      "provider_record_id": "SUSE-SU-2022:1315-1",
      "provider_updated_at": "2025-05-02T04:31:05.142033Z",
      "applicability_unknown": true
    }
  ]
}

[Debian bug #986217]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

  • [libnetty-java]Unknown

    Source package: [netty]

    Details (4)

    • 1:4.1.48-7+deb12u2 · all · bookworm

      Fixed · Fixed: 1:4.1.48-4

      nvd · netty · debian · bookworm; nvd · netty · debian · 12

    • 1:4.1.48-7+deb12u2 · all · bookworm

      Fixed · Fixed: 1:4.1.48-4

      nvd · netty · debian · bookworm; nvd · netty · debian · 12

    • 1:4.1.48-7+deb12u2 · all · bookworm-security

      Fixed · Fixed: 1:4.1.48-4

      nvd · netty · debian · bookworm; nvd · netty · debian · 12

    • 1:4.1.48-7+deb12u2 · all · bookworm-security

      Fixed · Fixed: 1:4.1.48-4

      nvd · netty · debian · bookworm; nvd · netty · debian · 12

[Debian 13 (Trixie)]

  • [libnetty-java]Unknown

    Source package: [netty]

    Details (4)

    • 1:4.1.48-10+deb13u1 · all · trixie

      Fixed · Fixed: 1:4.1.48-4

      nvd · netty · debian · 13

    • 1:4.1.48-10+deb13u1 · all · trixie

      Fixed · Fixed: 1:4.1.48-4

      nvd · netty · debian · 13

    • 1:4.1.48-10+deb13u1 · all · trixie-security

      Fixed · Fixed: 1:4.1.48-4

      nvd · netty · debian · 13

    • 1:4.1.48-10+deb13u1 · all · trixie-security

      Fixed · Fixed: 1:4.1.48-4

      nvd · netty · debian · 13

[openSUSE Tumbleweed]

  • [netty]Unknown

    Source package: [netty]

    Details (1)

    • 4.1.136-1.1 · x86_64 · tumbleweed

      Fixed · Fixed: 4.1.114-1.1

      nvd · netty · opensuse · tumbleweed

  • [netty-bom]Unknown

    Source package: [netty]

    Details (1)

    • 4.1.136-1.1 · noarch · tumbleweed

      Unknown · Fixed: 4.1.114-1.1

      Version impact unknown

      nvd · netty · opensuse · tumbleweed

  • [netty-javadoc]Unknown

    Source package: [netty]

    Details (1)

    • 4.1.136-1.1 · noarch · tumbleweed

      Unknown · Fixed: 4.1.114-1.1

      Version impact unknown

      nvd · netty · opensuse · tumbleweed

  • [netty-parent]Unknown

    Source package: [netty]

    Details (1)

    • 4.1.136-1.1 · noarch · tumbleweed

      Unknown · Fixed: 4.1.114-1.1

      Version impact unknown

      nvd · netty · opensuse · tumbleweed

Observed:

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]