{"cve":"CVE-2020-10687","nvd":{"published":"2020-09-23T13:15:15.157","modified":"2026-06-17T02:48:15.467","status":"Modified","description":"A flaw was discovered in all versions of Undertow before Undertow 2.2.0.Final, where 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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","score":4.8},"cwes":["CWE-444"],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=1785049","https://lists.apache.org/thread.html/r6603513ea8afbf6857fd77ca5888ec8385d0af493baa4250e28c351c%40%3Cdev.cxf.apache.org%3E","https://security.netapp.com/advisory/ntap-20220210-0015/","https://bugzilla.redhat.com/show_bug.cgi?id=1785049","https://lists.apache.org/thread.html/r6603513ea8afbf6857fd77ca5888ec8385d0af493baa4250e28c351c%40%3Cdev.cxf.apache.org%3E"],"products":["redhat:jboss_enterprise_application_platform","redhat:single_sign-on","redhat:undertow"],"source":"nvd","synced_at":"2026-10-19T21:09:53.489947993+00:00"},"epss":{"cve":"CVE-2020-10687","score":0.01231,"percentile":0.68961,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-p9w3-gwc2-cr49","url":"https://osv.dev/vulnerability/GHSA-p9w3-gwc2-cr49","summary":"HTTP Request Smuggling in Undertow","modified":"2024-02-17T05:34:29.176855Z","packages":[{"ecosystem":"Maven","name":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","ranges":["<2.2.0.Final"],"fixed":["2.2.0.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."]}