{"cve":"CVE-2025-9784","nvd":{"published":"2025-09-02T14:15:36.593","modified":"2026-10-14T17:17:41.947","status":"Modified","description":"A flaw was found in Undertow where malformed client requests can trigger server-side stream resets without triggering abuse counters. This issue, referred to as the \"MadeYouReset\" attack, allows malicious clients to induce excessive server workload by repeatedly causing server-side stream aborts. While not a protocol bug, this highlights a common implementation weakness that can be exploited to cause a denial of service (DoS).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-770","CWE-404"],"references":["https://access.redhat.com/errata/RHSA-2025:23143","https://access.redhat.com/errata/RHSA-2026:0383","https://access.redhat.com/errata/RHSA-2026:0384","https://access.redhat.com/errata/RHSA-2026:0386","https://access.redhat.com/errata/RHSA-2026:33371"],"products":["redhat:build_of_apache_camel_for_spring_boot","redhat:enterprise_linux","redhat:fuse","redhat:jboss_enterprise_application_platform","redhat:jboss_enterprise_application_platform_expansion_pack","redhat:process_automation","redhat:single_sign-on","redhat:undertow"],"source":"nvd","synced_at":"2026-10-19T22:07:46.309729541+00:00"},"epss":{"cve":"CVE-2025-9784","score":0.02325,"percentile":0.8338,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-95h4-w6j8-2rp8","url":"https://osv.dev/vulnerability/GHSA-95h4-w6j8-2rp8","summary":"Undertow MadeYouReset HTTP/2 DDoS Vulnerability","modified":"2026-10-06T00:45:07.202556119Z","packages":[{"ecosystem":"Maven","name":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","ranges":["<2.2.38.Final"],"fixed":["2.2.38.Final"]},{"ecosystem":"Maven","name":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","ranges":[">=2.3.0.Alpha1 <2.3.20.Final"],"fixed":["2.3.20.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."]}