{"id":"CVE-2019-1429","kind":"vulnerability","aliases":["CVE-2019-1429"],"related":[],"title":"Microsoft Internet Explorer: Microsoft Internet Explorer Scripting Engine Memory Corruption Vulnerability","description":"A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka 'Scripting Engine Memory Corruption Vulnerability'. This CVE ID is unique from CVE-2019-1426, CVE-2019-1427, CVE-2019-1428.","summary":"Microsoft Internet Explorer's scripting engine has a memory corruption bug that lets a page run code as the current user. CISA lists it as actively exploited in the wild.","severity":"high","cvss":7.6,"epss":0.7729,"exploited":true,"exploited_at":"2021-11-03T00:00:00+00:00","products":[{"name":"Microsoft Internet Explorer","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["browser","exploited","infrastructure","internet-explorer","windows"],"not_affected_if":["managed-hosting","no-internet-explorer"],"how_to_check":null,"fix":"Apply the Microsoft updates for the vulnerability per vendor instructions; the sources do not name a specific patch or version.","status":"open","published_at":"2019-11-12T19:15:14+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:37:25+00:00","updated_at":"2026-10-23T21:57:34+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T21:37:25Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft updates for the vulnerability per vendor instructions; the sources do not name a specific patch or version.","reach":"internet","impact":"high","summary":"Microsoft Internet Explorer's scripting engine has a memory corruption bug that lets a page run code as the current user. CISA lists it as actively exploited in the wild.","category":"infrastructure","who_cares":["windows","internet-explorer","browser"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker runs code as the logged-in user via a crafted web page","analyst_note":"Find the Microsoft advisory and patch list for CVE-2019-1429 and confirm affected IE and Windows builds, plus a check for whether IE is still present on the host.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["no-internet-explorer","managed-hosting"],"user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000457,"input_tokens":2839,"output_tokens":346,"severity_before":"unknown"},"analyst_status":"queued","analyst_note":"Find the Microsoft advisory and patch list for CVE-2019-1429 and confirm affected IE and Windows builds, plus a check for whether IE is still present on the host.","search":"'-1426':92C '-1427':95C '-1428':98C '-1429':14A,17A '-2019':13A,16A,91C,94C,97C 'activ':53B 'aka':78C 'browser':21B 'bug':38B 'cisa':49B 'code':44B,60C 'corrupt':10A,37B,82C 'current':47B 'cve':12A,15A,85C,90C,93C,96C 'engin':8A,33B,70C,80C 'execut':61C 'exist':63C 'exploit':22B,54B 'explor':3A,6A,26B,30B,77C 'explorer':20A 'handl':71C 'id':86C 'infrastructur':23B 'internet':2A,5A,19A,25B,29B,76C 'internet-explor':24B 'let':40B 'list':50B 'memori':9A,36B,74C,81C 'microsoft':1A,4A,18A,28B 'object':72C 'page':42B 'remot':59C 'run':43B 'script':7A,32B,69C,79C 'uniqu':88C 'user':48B 'vulner':11A,62C,83C 'way':66C 'wild':57B 'window':27B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2019-11-12T19:15:14+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:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2019-1429","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2019-1429","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":"2026-10-25T15:39:44+00:00","note":null},{"source":"epss","external_id":"CVE-2019-1429","url":"https://api.first.org/data/v1/epss?cve=CVE-2019-1429","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-2019-1429","url":"https://nvd.nist.gov/vuln/detail/CVE-2019-1429","severity":null,"published_at":"2019-11-12T19:15:14+00:00","modified_at":"2026-06-17T02:28:35+00:00","first_seen_at":"2026-10-23T21:57:34+00:00","fetched_at":"2026-10-23T21:57:34+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"}