{"id":"CVE-2017-7559","aliases":["GHSA-rj76-h87p-r3wf"],"url":"https://o3.security/vulnerability/CVE-2017-7559","summary":"Undertow vulnerable to Request Smuggling","details":"In Undertow 2.x before 2.0.0.Alpha2, 1.4.x before 1.4.17.Final, and 1.3.x before 1.3.31.Final, it was found that the fix for CVE-2017-2666 was incomplete and invalid characters are still allowed in the query string and path parameters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack, or obtain sensitive information from requests other than their own.","published":"2018-01-10T15:29:00.317Z","modified":"2026-07-08T11:36:19.671226Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"io.undertow:undertow-core","fixedVersion":"1.4.17.Final"},{"ecosystem":"Maven","name":"io.undertow:undertow-core","fixedVersion":"1.3.31.Final"},{"ecosystem":"Maven","name":"io.undertow:undertow-core","fixedVersion":"2.0.0.Alpha2"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2017:3454"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2017:3455"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2017:3456"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2017:3458"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2018:0002"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2018:0003"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2018:0004"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2018:0005"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2018:1322"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7559"},{"type":"REPORT","url":"https://issues.jboss.org/browse/UNDERTOW-1251"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T11:36:19.671226Z"}}