{"schemaVersion":3,"id":"CVE-2009-0901","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"The Active Template Library (ATL) in Microsoft Visual Studio .NET 2003 SP1, Visual Studio 2005 SP1 and 2008 Gold, and Visual C++ 2005 SP1 and 2008 Gold and SP1; and Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 Gold and SP2; does not prevent VariantClear calls on an uninitialized VARIANT, which allows remote attackers to execute arbitrary code via a malformed stream to an ATL (1) component or (2) control, related to ATL headers and error handling, aka \"ATL Uninitialized Object Vulnerability.\"","dates":{"published":"2009-07-29T17:00:00.000Z","modified":"2026-05-27T15:34:23.416Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.3,"severity":"high","version":"2.0","versionLabel":"v2.0","source":"NVD","vector":"AV:N/AC:M/Au:N/C:C/I:C/A:C","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":8.8,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8.8,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":9.3,"severity":"high","vector":"AV:N/AC:M/Au:N/C:C/I:C/A:C","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.36608,"percentile":0.98489,"severity":"high","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.36608},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.36608,"percentile":0.98489}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.36608,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.36608,"percentile":0.98489}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-94","name":"Improper Control of Generation of Code ('Code Injection')","description":"The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/94.html"},{"id":"CWE-457","name":"Use of Uninitialized Variable","description":"The code uses a variable that has not been initialized, leading to unpredictable or unintended results.","type":"weakness","status":"Draft","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/457.html"}],"affected":[{"vendor":"microsoft","product":"visual_c\\#","name":"visual c\\#","label":"visual_c\\#","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"2005:sp1_redistribution_pkg","noFixRecorded":false,"fixedIn":null},{"text":"2008:redistribution_pkg","noFixRecorded":false,"fixedIn":null},{"text":"2008:sp1_redistribution_pkg","noFixRecorded":false,"fixedIn":null}],"versionsText":"2005:sp1_redistribution_pkg | 2008:redistribution_pkg | 2008:sp1_redistribution_pkg","eol":null,"hubHref":"/vendor/microsoft/visual_c"},{"vendor":"microsoft","product":"visual_studio","name":"visual studio","label":"visual_studio","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"2005:sp1","noFixRecorded":false,"fixedIn":null},{"text":"2008","noFixRecorded":false,"fixedIn":null},{"text":"2008:sp1","noFixRecorded":false,"fixedIn":null}],"versionsText":"2005:sp1 | 2008 | 2008:sp1","eol":null,"hubHref":"/vendor/microsoft/visual_studio"},{"vendor":"microsoft","product":"visual_studio_.net","name":"visual studio .net","label":"visual_studio_.net","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"2003:sp1","noFixRecorded":false,"fixedIn":null}],"versionsText":"2003:sp1","eol":null,"hubHref":"/vendor/microsoft/visual_studio_net"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"http://www.adobe.com/support/security/bulletins/apsb09-11.html","label":"www.adobe.com/support/security/bulletins/apsb09-11.html","hostname":"www.adobe.com","tags":["X Refsource CONFIRM","Patch"]},{"url":"http://sunsolve.sun.com/search/document.do?assetkey=1-66-266108-1","label":"sunsolve.sun.com/search/document.do?assetkey=1-66-266108-1","hostname":"sunsolve.sun.com","tags":["Vendor Advisory","X Refsource SUNALERT"]},{"url":"http://www.securityfocus.com/bid/35832","label":"www.securityfocus.com/bid/35832","hostname":"www.securityfocus.com","tags":["VDB Entry","X Refsource BID","Patch"]},{"url":"http://www.vupen.com/english/advisories/2009/2034","label":"www.vupen.com/english/advisories/2009/2034","hostname":"www.vupen.com","tags":["VDB Entry","X Refsource VUPEN"]},{"url":"http://www.us-cert.gov/cas/techalerts/TA09-223A.html","label":"www.us-cert.gov/cas/techalerts/TA09-223A.html","hostname":"www.us-cert.gov","tags":["Third Party Advisory","X Refsource CERT","US Government Resource"]},{"url":"http://www.adobe.com/support/security/bulletins/apsb09-13.html","label":"www.adobe.com/support/security/bulletins/apsb09-13.html","hostname":"www.adobe.com","tags":["X Refsource CONFIRM"]},{"url":"http://www.novell.com/support/viewContent.do?externalId=7004997&sliceId=1","label":"www.novell.com/support/viewContent.do?externalId=7004997&sliceId=1","hostname":"www.novell.com","tags":["X Refsource CONFIRM"]},{"url":"http://www.us-cert.gov/cas/techalerts/TA09-286A.html","label":"www.us-cert.gov/cas/techalerts/TA09-286A.html","hostname":"www.us-cert.gov","tags":["Third Party Advisory","X Refsource CERT","US Government Resource"]},{"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-035","label":"docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-035","hostname":"docs.microsoft.com","tags":["Vendor Advisory","X Refsource MS"]},{"url":"http://blogs.technet.com/srd/archive/2009/08/11/ms09-037-why-we-are-using-cve-s-already-used-in-ms09-035.aspx","label":"blogs.technet.com/srd/…","hostname":"blogs.technet.com","tags":["X Refsource MISC"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7581","label":"oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7581","hostname":"oval.cisecurity.org","tags":["VDB Entry","Signature","X Refsource OVAL"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6289","label":"oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6289","hostname":"oval.cisecurity.org","tags":["VDB Entry","Signature","X Refsource OVAL"]},{"url":"http://marc.info/?l=bugtraq&m=126592505426855&w=2","label":"marc.info?l=bugtraq&m=126592505426855&w=2","hostname":"marc.info","tags":["Vendor Advisory","X Refsource HP"]},{"url":"http://secunia.com/advisories/36187","label":"secunia.com/advisories/36187","hostname":"secunia.com","tags":["Third Party Advisory","X Refsource SECUNIA"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6311","label":"oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6311","hostname":"oval.cisecurity.org","tags":["VDB Entry","Signature","X Refsource OVAL"]},{"url":"http://www.vupen.com/english/advisories/2009/2232","label":"www.vupen.com/english/advisories/2009/2232","hostname":"www.vupen.com","tags":["VDB Entry","X Refsource VUPEN"]},{"url":"http://www.adobe.com/support/security/bulletins/apsb09-10.html","label":"www.adobe.com/support/security/bulletins/apsb09-10.html","hostname":"www.adobe.com","tags":["X Refsource CONFIRM"]},{"url":"http://secunia.com/advisories/36374","label":"secunia.com/advisories/36374","hostname":"secunia.com","tags":["Third Party Advisory","X Refsource SECUNIA"]},{"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-037","label":"docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-037","hostname":"docs.microsoft.com","tags":["Vendor Advisory","X Refsource MS"]},{"url":"http://www.adobe.com/support/security/advisories/apsa09-04.html","label":"www.adobe.com/support/security/advisories/apsa09-04.html","hostname":"www.adobe.com","tags":["X Refsource CONFIRM","Patch"]},{"url":"http://secunia.com/advisories/36746","label":"secunia.com/advisories/36746","hostname":"secunia.com","tags":["Third Party Advisory","X Refsource SECUNIA"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6373","label":"oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6373","hostname":"oval.cisecurity.org","tags":["VDB Entry","Signature","X Refsource OVAL"]},{"url":"http://secunia.com/advisories/35967","label":"secunia.com/advisories/35967","hostname":"secunia.com","tags":["Third Party Advisory","X Refsource SECUNIA"]},{"url":"http://www.us-cert.gov/cas/techalerts/TA09-195A.html","label":"www.us-cert.gov/cas/techalerts/TA09-195A.html","hostname":"www.us-cert.gov","tags":["Third Party Advisory","X Refsource CERT","US Government Resource"]},{"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-060","label":"docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-060","hostname":"docs.microsoft.com","tags":["Vendor Advisory","X Refsource MS"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2009-07-29T17:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-05-27T15:34:23.416Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T19:52:23.384Z","stale":false,"partial":false}}