{"cve":"CVE-2014-6229","nvd":{"published":"2014-12-28T15:59:04.143","modified":"2026-06-17T00:12:44.640","status":"Modified","description":"The HashContext class in hphp/runtime/ext/ext_hash.cpp in Facebook HipHop Virtual Machine (HHVM) before 3.3.0 incorrectly expects that a certain key string uses '\\0' for termination, which allows remote attackers to obtain sensitive information by leveraging read access beyond the end of the string, and makes it easier for remote attackers to defeat cryptographic protection mechanisms by leveraging truncation of a string containing an internal '\\0' character.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-200"],"references":["http://hhvm.com/blog/6239/hhvm-3-3-0","https://github.com/facebook/hhvm/commit/7135ec229882370a00411aa50030eada6034cc1b","http://hhvm.com/blog/6239/hhvm-3-3-0","https://github.com/facebook/hhvm/commit/7135ec229882370a00411aa50030eada6034cc1b"],"products":["facebook:hiphop_virtual_machine"],"source":"nvd","synced_at":"2026-10-19T20:34:45.729216538+00:00"},"epss":{"cve":"CVE-2014-6229","score":0.01681,"percentile":0.76959,"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."]}