{"cve":"CVE-2018-6335","nvd":{"published":"2018-12-31T19:29:00.417","modified":"2026-06-17T02:01:41.137","status":"Modified","description":"A Malformed h2 frame can cause 'std::out_of_range' exception when parsing priority meta data. This behavior can lead to denial-of-service. This affects all supported versions of HHVM (3.25.2, 3.24.6, and 3.21.10 and below) when using the proxygen server to handle HTTP2 requests.","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","CWE-400"],"references":["https://github.com/facebook/hhvm/commit/4cb57dd753a339654ca464c139db9871fe961d56","https://hhvm.com/blog/2018/05/04/hhvm-3.25.3.html","https://github.com/facebook/hhvm/commit/4cb57dd753a339654ca464c139db9871fe961d56","https://hhvm.com/blog/2018/05/04/hhvm-3.25.3.html"],"products":["facebook:hhvm"],"source":"nvd","synced_at":"2026-10-19T20:54:36.112582389+00:00"},"epss":{"cve":"CVE-2018-6335","score":0.01469,"percentile":0.73733,"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."]}