{"cve":"CVE-2021-3629","nvd":{"published":"2022-05-24T19:15:09.093","modified":"2026-06-17T04:05:28.207","status":"Modified","description":"A 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 2.2.11.Final.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9},"cwes":["CWE-400"],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=1977362","https://security.netapp.com/advisory/ntap-20220729-0008/","https://bugzilla.redhat.com/show_bug.cgi?id=1977362","https://security.netapp.com/advisory/ntap-20220729-0008/"],"products":["netapp:active_iq_unified_manager","netapp:oncommand_insight","netapp:oncommand_workflow_automation","redhat:integration","redhat:jboss_enterprise_application_platform","redhat:single_sign-on","redhat:undertow","redhat:wildfly_core"],"source":"nvd","synced_at":"2026-10-19T21:31:59.322382750+00:00"},"epss":{"cve":"CVE-2021-3629","score":0.01322,"percentile":0.70897,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-rf6q-vx79-mjxr","url":"https://osv.dev/vulnerability/GHSA-rf6q-vx79-mjxr","summary":"Undertow Uncontrolled Resource Consumption","modified":"2025-06-12T16:45:56.696049Z","packages":[{"ecosystem":"Maven","name":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","ranges":["<2.0.40.Final"],"fixed":["2.0.40.Final"]},{"ecosystem":"Maven","name":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","ranges":[">=2.1.0 <2.2.11.Final"],"fixed":["2.2.11.Final"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}