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request smuggling in Undertow\nA flaw was found in Undertow. A regression in the fix for CVE-2020-10687 was found. HTTP request smuggling related to CVE-2017-2666 is possible against HTTP/1.x and HTTP/2 due to permitting invalid characters in an HTTP request. This flaw allows an attacker to poison a web-cache, perform an XSS attack, or obtain sensitive information from request other than their own. The highest threat from this vulnerability is to data confidentiality and integrity.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20220.json","reference_id":"","reference_type":"","scores":[{"value":"4.8","scoring_system":"cvssv3","scoring_elements":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-20220.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-20220","reference_id":"","reference_type":"","scores":[{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39916","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39866","published_at":"2026-04-13T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39886","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.3992","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39892","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39843","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39921","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39911","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39744","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00182","scoring_system":"epss","scoring_elements":"0.39898","published_at":"2026-04-08T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-20220"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=1923133","reference_id":"","reference_type":"","scores":[{"value":"4.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1923133"},{"reference_url":"https://github.com/undertow-io/undertow/commit/9e797b2f99617fdad0471eaa88c711ee7f44605f","reference_id":"","reference_type":"","scores":[{"value":"4.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/undertow-io/undertow/commit/9e797b2f99617fdad0471eaa88c711ee7f44605f"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20220","reference_id":"","reference_type":"","scores":[{"value":"4.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20220"},{"reference_url":"https://security.netapp.com/advisory/ntap-20220210-0013","reference_id":"","reference_type":"","scores":[{"value":"4.8","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://security.netapp.com/advisory/ntap-20220210-0013"},{"reference_url":"https://security.netapp.com/advisory/ntap-20220210-0013/","reference_id":"","reference_type":"","scores":[],"url":"https://security.netapp.com/advisory/ntap-20220210-0013/"},{"reference_url":"https://github.com/advisories/GHSA-qjwc-v72v-fq6r","reference_id":"GHSA-qjwc-v72v-fq6r","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-qjwc-v72v-fq6r"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:0872","reference_id":"RHSA-2021:0872","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:0872"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:0873","reference_id":"RHSA-2021:0873","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:0873"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:0874","reference_id":"RHSA-2021:0874","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:0874"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:0885","reference_id":"RHSA-2021:0885","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:0885"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:0974","reference_id":"RHSA-2021:0974","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:0974"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:2210","reference_id":"RHSA-2021:2210","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:2210"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:2755","reference_id":"RHSA-2021:2755","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:2755"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/76627?format=json","purl":"pkg:maven/io.undertow/undertow-core@2.1.6","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:maven/io.undertow/undertow-core@2.1.6"},{"url":"http://public2.vulnerablecode.io/api/packages/215337?format=json","purl":"pkg:maven/io.undertow/undertow-core@2.1.6.Final","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-14ff-vn3t-vyhy"},{"vulnerability":"VCID-1vrj-chs2-d3ab"},{"vulnerability":"VCID-2cv5-9v62-kfbm"},{"vulnerability":"VCID-4v1f-kt5y-w7d1"},{"vulnerability":"VCID-5585-a76n-zubf"},{"vulnerability":"VCID-62gn-nwup-8uat"},{"vulnerability":"VCID-73st-24ck-uydb"},{"vulnerability":"VCID-7yc7-e35f-8uhj"},{"vulnerability":"VCID-93ut-2de3-ckc5"},{"vulnerability":"VCID-cf5j-2dz8-7bbu"},{"vulnerability":"VCID-gsr8-1dea-effx"},{"vulnerability":"VCID-ns3p-22xg-q3bz"},{"vulnerability":"VCID-usz2-tufg-k7gz"},{"vulnerability":"VCID-xftw-raz7-b7e1"},{"vulnerability":"VCID-xme8-usmd-vqg3"},{"vulnerability":"VCID-yn69-8upm-7yc2"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:maven/io.undertow/undertow-core@2.1.6.Final"}],"aliases":["CVE-2021-20220","GHSA-qjwc-v72v-fq6r"],"risk_score":3.1,"exploitability":"0.5","weighted_severity":"6.2","resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-bpuw-kn4r-6kau"},{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/55055?format=json","vulnerability_id":"VCID-gsr8-1dea-effx","summary":"undertow Race Condition vulnerability\nA flaw was found in undertow. The HTTP2SourceChannel fails to write the final frame under some circumstances, resulting in a denial of service. The highest threat from this vulnerability is availability. This flaw affects Undertow versions prior to 2.0.35.SP1, prior to 2.2.6.SP1, prior to 2.2.7.SP1, prior to 2.0.36.SP1, prior to 2.2.9.Final and prior to 2.0.39.Final.","references":[{"reference_url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3597.json","reference_id":"","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2021-3597.json"},{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2021-3597","reference_id":"","reference_type":"","scores":[{"value":"0.00169","scoring_system":"epss","scoring_elements":"0.38201","published_at":"2026-04-16T12:55:00Z"},{"value":"0.00169","scoring_system":"epss","scoring_elements":"0.38066","published_at":"2026-04-01T12:55:00Z"},{"value":"0.00169","scoring_system":"epss","scoring_elements":"0.38246","published_at":"2026-04-02T12:55:00Z"},{"value":"0.00169","scoring_system":"epss","scoring_elements":"0.38269","published_at":"2026-04-04T12:55:00Z"},{"value":"0.00169","scoring_system":"epss","scoring_elements":"0.38138","published_at":"2026-04-07T12:55:00Z"},{"value":"0.00169","scoring_system":"epss","scoring_elements":"0.38188","published_at":"2026-04-08T12:55:00Z"},{"value":"0.00169","scoring_system":"epss","scoring_elements":"0.38196","published_at":"2026-04-09T12:55:00Z"},{"value":"0.00169","scoring_system":"epss","scoring_elements":"0.38215","published_at":"2026-04-11T12:55:00Z"},{"value":"0.00169","scoring_system":"epss","scoring_elements":"0.38179","published_at":"2026-04-12T12:55:00Z"},{"value":"0.00169","scoring_system":"epss","scoring_elements":"0.38155","published_at":"2026-04-13T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2021-3597"},{"reference_url":"https://bugzilla.redhat.com/show_bug.cgi?id=1970930","reference_id":"","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1970930"},{"reference_url":"https://github.com/undertow-io/undertow","reference_id":"","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/undertow-io/undertow"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3597","reference_id":"","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3597"},{"reference_url":"https://security.netapp.com/advisory/ntap-20220804-0003","reference_id":"","reference_type":"","scores":[{"value":"5.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"MODERATE","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://security.netapp.com/advisory/ntap-20220804-0003"},{"reference_url":"https://security.netapp.com/advisory/ntap-20220804-0003/","reference_id":"","reference_type":"","scores":[],"url":"https://security.netapp.com/advisory/ntap-20220804-0003/"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=989861","reference_id":"989861","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=989861"},{"reference_url":"https://github.com/advisories/GHSA-mfhv-gwf8-4m88","reference_id":"GHSA-mfhv-gwf8-4m88","reference_type":"","scores":[{"value":"MODERATE","scoring_system":"cvssv3.1_qr","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-mfhv-gwf8-4m88"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:3466","reference_id":"RHSA-2021:3466","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:3466"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:3467","reference_id":"RHSA-2021:3467","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:3467"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:3468","reference_id":"RHSA-2021:3468","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:3468"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:3471","reference_id":"RHSA-2021:3471","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:3471"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:3516","reference_id":"RHSA-2021:3516","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:3516"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:3534","reference_id":"RHSA-2021:3534","reference_type":"","scores":[],"url":"https://access.redhat.com/errata/RHSA-2021:3534"},{"reference_url":"https://access.redhat.com/errata/RHSA-2021:3656","reference_id":"RHSA-2021:3656","reference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Uncontrolled Resource Consumption\nA flaw was found in Undertow. A potential security issue in flow control handling by the browser over HTTP/2 may potentially cause overhead or a denial of service in the server. The highest threat from this vulnerability is availability. This flaw affects Undertow versions prior to 2.0.40.Final and prior to 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