CVE-2009-1138
The LDAP service in Active Directory on Microsoft Windows 2000 SP4 does not properly free memory...
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2009-1138- CVSS 2.0
- 10.0 High
AV:N/AC:L/Au:N/C:C/I:C/A:C - Weakness
- CWE-399
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2009-1138- Updated
- 2026-11-02
EUVDEUVD-2009-1139 No score
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.
- Record
EUVD-2009-1139- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-qppm-3wfg-wfc7 No score
The LDAP service in Active Directory on Microsoft Windows 2000 SP4 does not properly free memory...
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.
- Record
GHSA-qppm-3wfg-wfc7- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2009-1138 is a high vulnerability (CVSS 10.0) in Microsoft Windows 2000, published June 10, 2009. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 39.4%, the 98th percentile. No source names a fixed version.
References
securityfocus.com/bid/35226
labs.idefense.com/intelligence/vulnerabilities/display.php?id=804
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6180
docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-018
support.avaya.com/elmodocs2/security/ASA-2009-214.htm
securitytracker.com/id?1022349