{"action":"Upgrade undertow to 2.2.0-1 or later.","affected":[{"fixed":"2.2.0-1","introduced":"0"}],"component":"undertow","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["2.2.0-1"],"id":"tcs_01M5NFAX21M9PT0TDKZR92T7Y7","modified_at":"2026-10-23T18:03:10.175972240Z","published_at":"2021-02-23T18:15:13.397Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-20220","https://security-tracker.debian.org/tracker/CVE-2021-20220"],"severity":{"label":"medium","score":4.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-20220","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-20220"}],"summary":"A 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 ch"}