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Vulnerability record · CVE-2009-1138 · published 10 June 2009

CVE-2009-1138: Microsoft windows 2000 vulnerability

Microsoft · Windows 2000

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.

10.0 CVSS 2.0 High EPSS 39% · top 1.4% CWE-399 · CWE-399
10.0CVSS 2.0 base score
39%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
20References
16 Jun 2026Last modified by NVD

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.

AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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 PatchVendor 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
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 PatchVendor 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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2009-1138), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.