{"id":"CVE-2019-0841","kind":"vulnerability","aliases":["CVE-2019-0841"],"related":[],"title":"Microsoft Windows: Microsoft Windows AppX Deployment Service (AppXSVC) Privilege Escalation Vulnerability","description":"An elevation of privilege vulnerability exists when Windows AppX Deployment Service (AppXSVC) improperly handles hard links, aka 'Windows Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2019-0730, CVE-2019-0731, CVE-2019-0796, CVE-2019-0805, CVE-2019-0836.","summary":"Windows AppX Deployment Service (AppXSVC) mishandles hard links, letting a local user escalate privileges. An attacker who already has a low-privilege foothold can run processes in an elevated context.","severity":"high","cvss":7.8,"epss":0.414,"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","self-hosted","windows"],"not_affected_if":["patched-windows"],"how_to_check":null,"fix":"Apply the Microsoft security update for CVE-2019-0841 per vendor instructions (CISA KEV required action).","status":"open","published_at":"2019-04-09T21:29:01+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:22:14+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-10-23T21:22:14Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft security update for CVE-2019-0841 per vendor instructions (CISA KEV required action).","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 low-privilege foothold can run processes in an elevated context.","category":"infrastructure","who_cares":["windows","self-hosted"],"confidence":0.7,"needs_auth":"yes","worst_case":"local attacker gains elevated SYSTEM-level process execution on Windows","analyst_note":"Confirm affected Windows builds and KB numbers from the Microsoft advisory for CVE-2019-0841 and add a detection method.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["patched-windows"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000452,"input_tokens":2861,"output_tokens":332,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-0730':88C '-0731':91C '-0796':94C '-0805':97C '-0836':100C '-0841':14A,17A '-2019':13A,16A,87C,90C,93C,96C,99C 'aka':74C 'alreadi':44B 'appx':5A,28B,66C 'appxsvc':8A,31B,69C 'attack':42B 'context':57B 'cve':12A,15A,81C,86C,89C,92C,95C,98C 'deploy':6A,29B,67C 'elev':56B,59C,76C 'escal':10A,39B 'exist':63C 'exploit':20B 'foothold':50B 'handl':71C 'hard':33B,72C 'host':25B 'id':82C 'improp':70C 'infrastructur':21B 'let':35B 'link':34B,73C 'local':37B 'low':48B 'low-privileg':47B 'microsoft':1A,3A,18A 'mishandl':32B 'privileg':9A,40B,49B,61C,78C 'process':53B 'ransomwar':22B 'run':52B 'self':24B 'self-host':23B 'servic':7A,30B,68C 'uniqu':84C 'user':38B 'vulner':11A,62C,79C 'window':2A,4A,26B,27B,65C,75C 'windows':19A","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2019-04-09T21:29:01+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-2019-0841","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2019-0841","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-2019-0841","url":"https://api.first.org/data/v1/epss?cve=CVE-2019-0841","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-2019-0841","url":"https://nvd.nist.gov/vuln/detail/CVE-2019-0841","severity":null,"published_at":"2019-04-09T21:29:01+00:00","modified_at":"2026-06-17T02:09:01+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"}