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…
- 10.0HighCVSS base score
- 39.4%Exploitation in 30 daysEPSS · top 1.4% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By microsoft
- 3 months later
· 3 months later
Published
- 15 years later
· 15 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | High10.0 | AV:N/AC:L/Au:N/C:C/I:C/A:C |
- EPSS (exploitation in 30 days)
- 39.4% · top 1.4% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 10.0.
Affected products
n/a
- affected n/a
References
References10
- 35226 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- 20090611 Microsoft Active Directory Hexdecimal DN AttributeValue Invalid Free Vulnerability (opens in a new tab)third-party-advisoryx_refsource_IDEFENSEx_transferred
- oval:org.mitre.oval:def:6180 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
- MS09-018 (opens in a new tab)vendor-advisoryx_refsource_MSx_transferred
- http://support.avaya.com/elmodocs2/security/ASA-2009-214.htm (opens in a new tab)x_refsource_CONFIRMx_transferred
- 1022349 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- ADV-2009-1537 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
- TA09-160A (opens in a new tab)third-party-advisoryx_refsource_CERTx_transferred
- 35355 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- 54937 (opens in a new tab)vdb-entryx_refsource_OSVDBx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2009-1139 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2009-1138)Record last updated .