{"id":"CVE-2022-21882","kind":"vulnerability","aliases":["CVE-2022-21882"],"related":[],"title":"Microsoft Win32k: Microsoft Win32k Privilege Escalation Vulnerability","description":"Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.\n\nCISA required action: Apply updates per vendor instructions.","summary":"Microsoft Win32k, the Windows kernel-mode graphics driver, has a flaw that lets a local user raise their privileges. An attacker who already has a low-privilege foothold on a Windows machine can gain SYSTEM-level control.","severity":"high","cvss":7.8,"epss":0.59205,"exploited":true,"exploited_at":"2022-02-04T00:00:00+00:00","products":[{"name":"Microsoft Win32k","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","ransomware","self-hosted","windows"],"not_affected_if":[],"how_to_check":null,"fix":"Apply the Microsoft security update for CVE-2022-21882 per vendor instructions (CISA KEV required action).","status":"open","published_at":"2022-01-11T21:15:11+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:28:57+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-10-23T21:28:57Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft security update for CVE-2022-21882 per vendor instructions (CISA KEV required action).\nunknown","reach":"local","impact":"high","summary":"Microsoft Win32k, the Windows kernel-mode graphics driver, has a flaw that lets a local user raise their privileges. An attacker who already has a low-privilege foothold on a Windows machine can gain SYSTEM-level control.","category":"infrastructure","who_cares":["windows","self-hosted"],"confidence":0.7,"needs_auth":"yes","worst_case":"Attacker with local low-privilege access gains SYSTEM rights on the machine","analyst_note":"Sources do not list affected Windows builds or KB numbers; check Microsoft's CVE-2022-21882 advisory for affected versions and patch IDs.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":[],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000458,"input_tokens":2818,"output_tokens":353,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2022':9A,12A '-21882':10A,13A 'action':76C 'allow':70C 'alreadi':46B 'appli':77C 'attack':44B 'cisa':74C 'contain':65C 'control':62B 'cve':8A,11A 'driver':31B 'escal':6A,73C 'exploit':16B 'flaw':34B 'foothold':52B 'gain':58B 'graphic':30B 'host':21B 'infrastructur':17B 'instruct':81C 'kernel':28B 'kernel-mod':27B 'let':36B 'level':61B 'local':38B 'low':50B 'low-privileg':49B 'machin':56B 'microsoft':1A,3A,14A,23B,63C 'mode':29B 'per':79C 'privileg':5A,42B,51B,72C 'rais':40B 'ransomwar':18B 'requir':75C 'self':20B 'self-host':19B 'system':60B 'system-level':59B 'unspecifi':67C 'updat':78C 'user':39B 'vendor':80C 'vulner':7A,68C 'win32k':2A,4A,15A,24B,64C 'window':22B,26B,55B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2022-01-11T21:15:11+00:00","kev":{"dateAdded":"2022-02-04","dueDate":"2022-02-18","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2022-21882","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2022-21882","severity":null,"published_at":"2022-02-04T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:53+00:00","fetched_at":"2026-10-25T11:39:17+00:00","note":null},{"source":"epss","external_id":"CVE-2022-21882","url":"https://api.first.org/data/v1/epss?cve=CVE-2022-21882","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-2022-21882","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-21882","severity":null,"published_at":"2022-01-11T21:15:11+00:00","modified_at":"2026-08-15T04:18:00+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"}