{"cve":"CVE-2024-4027","nvd":{"published":"2026-01-30T15:16:07.113","modified":"2026-09-01T13:17:40.167","status":"Deferred","description":"A flaw was found in Undertow. Servlets using a method that calls HttpServletRequestImpl.getParameterNames() can cause an OutOfMemoryError when the client sends a request with large parameter names. This issue can be exploited by an unauthorized user to cause a remote denial-of-service (DoS) attack.","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-20"],"references":["https://access.redhat.com/security/cve/CVE-2024-4027","https://bugzilla.redhat.com/show_bug.cgi?id=2276410","https://access.redhat.com/security/cve/CVE-2024-4027","https://bugzilla.redhat.com/show_bug.cgi?id=2276410","https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-4027.json"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:22:27.261130201+00:00"},"epss":{"cve":"CVE-2024-4027","score":0.00401,"percentile":0.34356,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-33hj-rcmx-86mv","url":"https://osv.dev/vulnerability/GHSA-33hj-rcmx-86mv","summary":"Undertow Servlets Vulnerable to Remote DoS via OutOfMemoryError when Passed Large Parameter Names","modified":"2026-02-25T20:33:11.939526Z","packages":[{"ecosystem":"Maven","name":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","ranges":["<2.2.39.Final"],"fixed":["2.2.39.Final"]},{"ecosystem":"Maven","name":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","ranges":[">=2.4.0.Alpha1 <2.4.0.Beta1"],"fixed":["2.4.0.Beta1"]},{"ecosystem":"Maven","name":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","ranges":[">=2.3.0.Alpha1 <2.3.21.Final"],"fixed":["2.3.21.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."]}