{"cve":"CVE-2009-1138","nvd":{"published":"2009-06-10T18:00:00.377","modified":"2026-06-16T23:06:35.307","status":"Modified","description":"The LDAP service in Active Directory on Microsoft Windows 2000 SP4 does not properly free memory for LDAP and LDAPS requests, which allows remote attackers to execute arbitrary code via a request that uses hexadecimal encoding, whose associated memory is not released, related to a \"DN AttributeValue,\" aka \"Active Directory Invalid Free Vulnerability.\"  NOTE: this issue is probably a memory leak.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-399"],"references":["http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=804","http://osvdb.org/54937","http://secunia.com/advisories/35355","http://support.avaya.com/elmodocs2/security/ASA-2009-214.htm","http://www.securityfocus.com/bid/35226"],"products":["microsoft:windows_2000"],"source":"nvd","synced_at":"2026-10-19T19:54:07.895733559+00:00"},"epss":{"cve":"CVE-2009-1138","score":0.39404,"percentile":0.98609,"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."]}