{"cve":"CVE-2023-4639","nvd":{"published":"2024-11-17T11:15:05.840","modified":"2026-06-17T06:38:16.520","status":"Deferred","description":"A flaw was found in Undertow, which incorrectly parses cookies with certain value-delimiting characters in incoming requests. This issue could allow an attacker to construct a cookie value to exfiltrate HttpOnly cookie values or spoof arbitrary additional cookie values, leading to unauthorized data access or modification. The main threat from this flaw impacts data confidentiality and integrity.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","score":7.4},"cwes":["CWE-444"],"references":["https://access.redhat.com/errata/RHSA-2024:1674","https://access.redhat.com/errata/RHSA-2024:1675","https://access.redhat.com/errata/RHSA-2024:1676","https://access.redhat.com/errata/RHSA-2024:1677","https://access.redhat.com/errata/RHSA-2024:2763"],"products":[],"source":"nvd","synced_at":"2026-10-19T21:57:34.731061660+00:00"},"epss":{"cve":"CVE-2023-4639","score":0.01093,"percentile":0.65456,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-3jrv-jgp8-45v3","url":"https://osv.dev/vulnerability/GHSA-3jrv-jgp8-45v3","summary":"Undertow incorrectly parses cookies","modified":"2025-02-07T18:34:38.348919Z","packages":[{"ecosystem":"Maven","name":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","ranges":[">=2.3.0.Alpha1 <2.3.11.Final"],"fixed":["2.3.11.Final"]},{"ecosystem":"Maven","name":"io.undertow:undertow-core","purl":"pkg:maven/io.undertow/undertow-core","ranges":["<2.2.30.Final"],"fixed":["2.2.30.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."]}