{"id":"CVE-2009-1123","published":"2009-06-10T18:30:00Z","modified":"2026-06-16T23:06:33Z","title":"Microsoft Windows Improper Input Validation Vulnerability","vendor":"Microsoft","product":"Windows","tier":"core","eol":null,"description":{"text":"The kernel in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 SP2 does not properly validate changes to unspecified kernel objects, which allows local users to gain privileges via a crafted application, aka \"Windows Kernel Desktop Vulnerability.\"","provenance":"source","from":"NVD"},"summary":{"text":"The flaw is an improper input validation issue in the Windows kernel of Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista, and Server 2008 SP2, where changes to unspecified kernel objects are not properly validated. An attacker with local access can use a crafted application to gain elevated privileges, provided a user interacts with that application.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:13:52Z"},"cvss":{"score":7.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.04878,"percentile":0.92029,"date":"2026-10-28","provenance":"source"},"kev":{"dateAdded":"2022-03-03","dueDate":"2022-03-24","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2009-1123","provenance":"source"},"vulncheckKev":{"dateAdded":"2016-08-04","exploitedFirstSeen":"2016-08-04","ransomware":false,"evidence":[{"url":"https://www.recordedfuture.com/russian-apt-toolkits","date":"2016-08-04"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2022-03-03"}],"evidenceTotal":2,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-20","name":"Improper Input Validation"}],"references":[{"url":"http://osvdb.org/54940","tags":["Broken Link"]},{"url":"http://secunia.com/advisories/35372","tags":["Broken Link"]},{"url":"http://www.securitytracker.com/id?1022359","tags":["Broken Link","Third Party Advisory","VDB Entry"]},{"url":"http://www.us-cert.gov/cas/techalerts/TA09-160A.html","tags":["Broken Link","Third Party Advisory","US Government Resource"]},{"url":"http://www.vupen.com/english/advisories/2009/1544","tags":["Broken Link"]},{"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-025","tags":["Patch","Vendor Advisory"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6206","tags":["Broken Link"]},{"url":"http://osvdb.org/54940","tags":["Broken Link"]},{"url":"http://secunia.com/advisories/35372","tags":["Broken Link"]},{"url":"http://www.securitytracker.com/id?1022359","tags":["Broken Link","Third Party Advisory","VDB Entry"]},{"url":"http://www.us-cert.gov/cas/techalerts/TA09-160A.html","tags":["Broken Link","Third Party Advisory","US Government Resource"]},{"url":"http://www.vupen.com/english/advisories/2009/1544","tags":["Broken Link"]},{"url":"https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-025","tags":["Patch","Vendor Advisory"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6206","tags":["Broken Link"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2009-1123","tags":["US Government Resource"]}],"techniques":[{"id":"T1068","name":"Exploitation for Privilege Escalation","tactics":["privilege-escalation"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: kernel flaw exploited for privilege escalation","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"does not properly validate changes to unspecified kernel objects","start":121,"end":185}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1548","name":"Abuse Elevation Control Mechanism","tactics":["privilege-escalation"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: local user gains elevated privileges","mappingType":"primary_impact","evidence":[{"from":"description","quote":"allows local users to gain privileges via a crafted application","start":193,"end":256}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2009-1124","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2009-1124","exploited":true,"exploitedSince":"2022-03-03","provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1068"],"provenance":"ai"},{"stage":"primary","techniques":["T1548"],"provenance":"ai"}],"timeline":[{"date":"2009-06-10","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2009-1123","provenance":"source"},{"date":"2016-08-04","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://www.recordedfuture.com/russian-apt-toolkits","provenance":"source"},{"date":"2022-03-03","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2022-03-03","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2009-1124","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":4649},"priority":{"score":61.9,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 3738 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":18.41,"detail":"percentile 0.9203"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":0.0,"detail":"none found"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":5.46,"detail":"base score 7.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-microsoft-windows-cwe-20"}}