{"cve":"CVE-2023-40518","nvd":{"published":"2023-08-14T22:15:14.327","modified":"2026-06-17T06:18:17.707","status":"Modified","description":"LiteSpeed OpenLiteSpeed before 1.7.18 does not strictly validate HTTP request headers.","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:H/A:N","score":7.5},"cwes":[],"references":["https://openlitespeed.org/release-log/version-1-7-x/","https://www.litespeedtech.com/products/litespeed-web-server/release-log","https://openlitespeed.org/release-log/version-1-7-x/","https://www.litespeedtech.com/products/litespeed-web-server/release-log"],"products":["litespeedtech:openlitespeed"],"source":"nvd","synced_at":"2026-10-19T21:39:14.809778102+00:00"},"epss":{"cve":"CVE-2023-40518","score":0.00652,"percentile":0.51254,"date":"2026-10-31"},"kev":null,"osv":[],"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."]}