{"id":"CVE-2009-1123","kind":"vulnerability","aliases":["CVE-2009-1123"],"related":[],"title":"Microsoft Windows: Microsoft Windows Improper Input Validation Vulnerability","description":"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.\"","summary":"The Windows kernel does not properly validate changes to certain kernel objects. A local user running a crafted application can gain higher privileges on the machine.","severity":"high","cvss":7.8,"epss":0.04878,"exploited":true,"exploited_at":"2022-03-03T00:00:00+00:00","products":[{"name":"Microsoft Windows","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","self-hosted","windows"],"not_affected_if":["patched-windows"],"how_to_check":null,"fix":"Apply the Microsoft updates for this CVE per vendor instructions, as CISA requires; the sources do not name the specific update or KB.","status":"open","published_at":"2009-06-10T18:30:00+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:26:25+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-10-23T21:26:25Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft updates for this CVE per vendor instructions, as CISA requires; the sources do not name the specific update or KB.","reach":"local","impact":"high","summary":"The Windows kernel does not properly validate changes to certain kernel objects. A local user running a crafted application can gain higher privileges on the machine.","category":"infrastructure","who_cares":["windows","self-hosted"],"confidence":0.7,"needs_auth":"yes","worst_case":"local user gains SYSTEM-level privileges on the Windows machine","analyst_note":"Find the Microsoft security bulletin and the affected Windows builds for CVE-2009-1123 to fill in how_to_check and fix; the sources list no versions.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["patched-windows"],"user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000444,"input_tokens":2828,"output_tokens":322,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-1123':11A,14A '-2009':10A,13A '2000':54C '2003':61C '2008':70C 'aka':92C 'allow':82C 'applic':41B,91C 'certain':32B 'chang':30B,76C 'craft':40B,90C 'cve':9A,12A 'desktop':95C 'exploit':17B 'gain':43B,86C 'gold':64C 'higher':44B 'host':21B 'improp':5A 'infrastructur':18B 'input':6A 'kernel':25B,33B,50C,79C,94C 'local':36B,83C 'machin':48B 'microsoft':1A,3A,15A,52C 'object':34B,80C 'privileg':45B,87C 'proper':28B,74C 'run':38B 'self':20B 'self-host':19B 'server':60C,69C 'sp1':65C 'sp2':57C,62C,67C,71C 'sp3':59C 'sp4':55C 'unspecifi':78C 'user':37B,84C 'valid':7A,29B,75C 'via':88C 'vista':63C 'vulner':8A,96C 'window':2A,4A,22B,24B,53C,93C 'windows':16A 'xp':56C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2009-06-10T18:30:00+00:00","kev":{"dateAdded":"2022-03-03","dueDate":"2022-03-24","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2009-1123","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2009-1123","severity":null,"published_at":"2022-03-03T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T15:39:43+00:00","note":null},{"source":"epss","external_id":"CVE-2009-1123","url":"https://api.first.org/data/v1/epss?cve=CVE-2009-1123","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:44+00:00","fetched_at":"2026-10-23T19:13:44+00:00","note":null},{"source":"nvd","external_id":"CVE-2009-1123","url":"https://nvd.nist.gov/vuln/detail/CVE-2009-1123","severity":null,"published_at":"2009-06-10T18:30:00+00:00","modified_at":"2026-06-16T23:06:33+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}