CVE-2009-1138
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.
Key facts
- CVSS score
- 10.0 (v2.0)
- Severity
- HIGH
- CVSS vector
AV:N/AC:L/Au:N/C:C/I:C/A:C- Weakness (CWE)
- CWE-399
- EPSS score
- 39.4% (99th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2009-1139)
- Published
- June 10, 2009
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2009-1139 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.
View on the EU Vulnerability DatabaseAffected products
- microsoft / windows 2000
References
- http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=804
- http://osvdb.org/54937
- http://secunia.com/advisories/35355(Vendor Advisory)
- http://support.avaya.com/elmodocs2/security/ASA-2009-214.htm
- http://www.securityfocus.com/bid/35226(Patch)
- http://www.securitytracker.com/id?1022349
- http://www.us-cert.gov/cas/techalerts/TA09-160A.html(US Government Resource)
- http://www.vupen.com/english/advisories/2009/1537(Patch, Vendor Advisory)
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-018
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6180
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
Query CVEs from your AI assistant
The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.
Add the CVE brain