{"id":"CVE-2019-1129","kind":"vulnerability","aliases":["CVE-2019-1129"],"related":[],"title":"Microsoft Windows: Microsoft Windows AppX Deployment Service (AppXSVC) Privilege Escalation Vulnerability","description":"A privilege escalation vulnerability exists when Windows AppXSVC improperly handles hard links. An attacker who successfully exploited this vulnerability could run processes in an elevated context.\n\nCISA required action: Apply updates per vendor instructions.","summary":"Windows AppX Deployment Service (AppXSVC) mishandles hard links, letting a local user escalate privileges. An attacker who already has a foothold on the machine can run processes in an elevated context.","severity":"high","cvss":7.8,"epss":0.01782,"exploited":true,"exploited_at":"2022-03-15T00:00:00+00:00","products":[{"name":"Microsoft Windows","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","ransomware","windows"],"not_affected_if":["patched-systems"],"how_to_check":null,"fix":"Apply the Microsoft Windows update for CVE-2019-1129 per vendor instructions, as CISA requires.","status":"open","published_at":"2019-07-15T19:15:20+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:22:12+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T21:22:12Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft Windows update for CVE-2019-1129 per vendor instructions, as CISA requires.","reach":"local","impact":"high","summary":"Windows AppX Deployment Service (AppXSVC) mishandles hard links, letting a local user escalate privileges. An attacker who already has a foothold on the machine can run processes in an elevated context.","category":"infrastructure","who_cares":["windows"],"confidence":0.6,"needs_auth":"yes","worst_case":"Local user gains elevated privileges and runs processes as a higher-privilege account","analyst_note":"Find the patched Windows build and KB number for CVE-2019-1129 on the Microsoft Security Response Center advisory and CISA KEV entry; sources give no affected or fixed versions.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["patched-systems"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000458,"input_tokens":2861,"output_tokens":344,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-1129':14A,17A '-2019':13A,16A 'action':83C 'alreadi':41B 'appli':84C 'appx':5A,25B 'appxsvc':8A,28B,62C 'attack':39B,68C 'cisa':81C 'context':54B,80C 'could':74C 'cve':12A,15A 'deploy':6A,26B 'elev':53B,79C 'escal':10A,36B,57C 'exist':59C 'exploit':20B,71C 'foothold':44B 'handl':64C 'hard':30B,65C 'improp':63C 'infrastructur':21B 'instruct':88C 'let':32B 'link':31B,66C 'local':34B 'machin':47B 'microsoft':1A,3A,18A 'mishandl':29B 'per':86C 'privileg':9A,37B,56C 'process':50B,76C 'ransomwar':22B 'requir':82C 'run':49B,75C 'servic':7A,27B 'success':70C 'updat':85C 'user':35B 'vendor':87C 'vulner':11A,58C,73C 'window':2A,4A,23B,24B,61C 'windows':19A","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2019-07-15T19:15:20+00:00","kev":{"dateAdded":"2022-03-15","dueDate":"2022-04-05","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-2019-1129","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2019-1129","severity":null,"published_at":"2022-03-15T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T10:39:07+00:00","note":null},{"source":"epss","external_id":"CVE-2019-1129","url":"https://api.first.org/data/v1/epss?cve=CVE-2019-1129","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-2019-1129","url":"https://nvd.nist.gov/vuln/detail/CVE-2019-1129","severity":null,"published_at":"2019-07-15T19:15:20+00:00","modified_at":"2026-06-17T02:27:53+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"}