{"id":"CVE-2019-1458","kind":"vulnerability","aliases":["CVE-2019-1458"],"related":[],"title":"Microsoft Win32k: Microsoft Win32k Privilege Escalation Vulnerability","description":"A privilege escalation vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka 'Win32k EoP.\n\nCISA required action: Apply updates per vendor instructions.","summary":"A flaw in the Windows Win32k kernel component mishandles objects in memory, letting a local user escalate privileges. Attackers exploit it in the wild and ransomware groups have used it, so a low-privilege foothold on a Windows machine can become SYSTEM.","severity":"high","cvss":7.8,"epss":0.74438,"exploited":true,"exploited_at":"2022-01-10T00:00:00+00:00","products":[{"name":"Microsoft Win32k","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","microsoft","ransomware","windows"],"not_affected_if":["patched-systems"],"how_to_check":null,"fix":"Apply the Microsoft security update for CVE-2019-1458 per vendor instructions, as CISA requires.","status":"open","published_at":"2019-12-10T22:15:16+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:31:38+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-10-23T21:31:38Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft security update for CVE-2019-1458 per vendor instructions, as CISA requires.","reach":"local","impact":"high","summary":"A flaw in the Windows Win32k kernel component mishandles objects in memory, letting a local user escalate privileges. Attackers exploit it in the wild and ransomware groups have used it, so a low-privilege foothold on a Windows machine can become SYSTEM.","category":"infrastructure","who_cares":["windows","microsoft"],"confidence":0.7,"needs_auth":"yes","worst_case":"Local low-privilege user gains SYSTEM rights on the Windows machine.","analyst_note":"Find the affected Windows builds and the patch KB numbers from the Microsoft advisory for CVE-2019-1458, since the sources give no version or check command.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["patched-systems"],"user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000462,"input_tokens":2836,"output_tokens":356,"severity_before":"unknown"},"analyst_status":"queued","analyst_note":"Find the affected Windows builds and the patch KB numbers from the Microsoft advisory for CVE-2019-1458, since the sources give no version or check command.","search":"'-1458':10A,13A '-2019':9A,12A 'action':87C 'aka':82C 'appli':88C 'attack':39B 'becom':62B 'cisa':85C 'compon':28B,74C 'cve':8A,11A 'eop':84C 'escal':6A,37B,66C 'exist':68C 'exploit':16B,40B 'fail':75C 'flaw':22B 'foothold':56B 'group':47B 'handl':78C 'infrastructur':17B 'instruct':92C 'kernel':27B 'let':33B 'local':35B 'low':54B 'low-privileg':53B 'machin':60B 'memori':32B,81C 'microsoft':1A,3A,14A,18B 'mishandl':29B 'object':30B,79C 'per':90C 'privileg':5A,38B,55B,65C 'proper':77C 'ransomwar':19B,46B 'requir':86C 'system':63B 'updat':89C 'use':49B 'user':36B 'vendor':91C 'vulner':7A,67C 'wild':44B 'win32k':2A,4A,15A,26B,73C,83C 'window':20B,25B,59B,70C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2019-12-10T22:15:16+00:00","kev":{"dateAdded":"2022-01-10","dueDate":"2022-07-10","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2019-1458","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2019-1458","severity":null,"published_at":"2022-01-10T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:53+00:00","fetched_at":"2026-10-25T13:39:32+00:00","note":null},{"source":"epss","external_id":"CVE-2019-1458","url":"https://api.first.org/data/v1/epss?cve=CVE-2019-1458","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-2019-1458","url":"https://nvd.nist.gov/vuln/detail/CVE-2019-1458","severity":null,"published_at":"2019-12-10T22:15:16+00:00","modified_at":"2026-08-12T05:17:25+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"}