{"cve":"CVE-2017-7559","nvd":{"published":"2018-01-10T15:29:00.317","modified":"2026-06-17T01:24:36.600","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-444"],"references":["https://access.redhat.com/errata/RHSA-2017:3454","https://access.redhat.com/errata/RHSA-2017:3455","https://access.redhat.com/errata/RHSA-2017:3456","https://access.redhat.com/errata/RHSA-2017:3458","https://access.redhat.com/errata/RHSA-2018:0002"],"products":["redhat:undertow"],"source":"nvd","synced_at":"2026-10-19T20:47:56.471723566+00:00"},"epss":{"cve":"CVE-2017-7559","score":0.01911,"percentile":0.79803,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-rj76-h87p-r3wf","url":"https://osv.dev/vulnerability/GHSA-rj76-h87p-r3wf","summary":"Undertow vulnerable to Request Smuggling","modified":"2023-11-08T03:59:25.234942Z","packages":[{"ecosystem":"Maven","name":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","ranges":[">=1.4.0 <1.4.17.Final"],"fixed":["1.4.17.Final"]},{"ecosystem":"Maven","name":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","ranges":[">=1.3.0 <1.3.31.Final"],"fixed":["1.3.31.Final"]},{"ecosystem":"Maven","name":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","ranges":[">=2.0.0.Alpha1 <2.0.0.Alpha2"],"fixed":["2.0.0.Alpha2"]}]}],"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."]}