{"id":"CVE-2020-17087","kind":"vulnerability","aliases":["CVE-2020-17087"],"related":[],"title":"Microsoft Windows: Microsoft Windows Kernel Privilege Escalation Vulnerability","description":"Microsoft Windows kernel contains an unspecified vulnerability that allows for privilege escalation.\n\nCISA required action: Apply updates per vendor instructions.","summary":"A flaw in the Windows kernel lets a local user with limited rights gain higher privileges, which is the kind of bug attackers chain after an initial foothold. CISA lists it as exploited in the wild.","severity":"high","cvss":7.8,"epss":0.05431,"exploited":true,"exploited_at":"2021-11-03T00:00:00+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 update for CVE-2020-17087 per vendor instructions, as CISA requires; the specific KB or patched build is not given in the sources.","status":"open","published_at":"2020-11-11T07:15:18+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:39:24+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T21:39:24Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft update for CVE-2020-17087 per vendor instructions, as CISA requires; the specific KB or patched build is not given in the sources.","reach":"local","impact":"high","summary":"A flaw in the Windows kernel lets a local user with limited rights gain higher privileges, which is the kind of bug attackers chain after an initial foothold. CISA lists it as exploited in the wild.","category":"infrastructure","who_cares":["windows","self-hosted"],"confidence":0.6,"needs_auth":"yes","worst_case":"Local attacker with a low-privilege account gains SYSTEM-level control of the machine.","analyst_note":"Find the Microsoft advisory and the affected Windows builds and KB numbers for CVE-2020-17087 via the MSRC entry for this CVE.","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":0.000459,"input_tokens":2816,"output_tokens":354,"severity_before":"unknown"},"analyst_status":"queued","analyst_note":"Find the Microsoft advisory and the affected Windows builds and KB numbers for CVE-2020-17087 via the MSRC entry for this CVE.","search":"'-17087':11A,14A '-2020':10A,13A 'action':73C 'allow':67C 'appli':74C 'attack':45B 'bug':44B 'chain':46B 'cisa':51B,71C 'contain':62C 'cve':9A,12A 'escal':7A,70C 'exploit':17B,55B 'flaw':24B 'foothold':50B 'gain':36B 'higher':37B 'host':21B 'infrastructur':18B 'initi':49B 'instruct':78C 'kernel':5A,28B,61C 'kind':42B 'let':29B 'limit':34B 'list':52B 'local':31B 'microsoft':1A,3A,15A,59C 'per':76C 'privileg':6A,38B,69C 'requir':72C 'right':35B 'self':20B 'self-host':19B 'unspecifi':64C 'updat':75C 'user':32B 'vendor':77C 'vulner':8A,65C 'wild':58B 'window':2A,4A,22B,27B,60C 'windows':16A","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2020-11-11T07:15:18+00:00","kev":{"dateAdded":"2021-11-03","dueDate":"2022-05-03","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:L/AC:L/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-2020-17087","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-17087","severity":null,"published_at":"2021-11-03T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:53+00:00","fetched_at":"2026-10-25T14:39:41+00:00","note":null},{"source":"epss","external_id":"CVE-2020-17087","url":"https://api.first.org/data/v1/epss?cve=CVE-2020-17087","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-2020-17087","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-17087","severity":null,"published_at":"2020-11-11T07:15:18+00:00","modified_at":"2026-06-17T02:58:39+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"}