{"id":"CVE-2018-8653","kind":"vulnerability","aliases":["CVE-2018-8653"],"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 affects Internet Explorer 9, Internet Explorer 11, Internet Explorer 10. This CVE ID is unique from CVE-2018-8643.","summary":"Microsoft Internet Explorer's scripting engine mishandles objects in memory, causing memory corruption. An attacker who gets a user to load a crafted web page can run code on that user's machine.","severity":"high","cvss":7.6,"epss":0.29606,"exploited":true,"exploited_at":"2021-11-03T00:00:00+00:00","products":[{"name":"Microsoft Internet Explorer","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["endpoints","exploited","internet-explorer","runtime","windows"],"not_affected_if":["ie-disabled","no-ie-installed"],"how_to_check":"Check whether Internet Explorer is installed and enabled on Windows endpoints, for example with the Windows optional features list or by looking for iexplore.exe.","fix":"Apply the Microsoft security update for the Internet Explorer scripting engine per vendor instructions, as CISA requires.","status":"open","published_at":"2018-12-20T13:29:00+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:39:20+00:00","updated_at":"2026-10-23T21:57:34+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-10-23T21:39:20Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft security update for the Internet Explorer scripting engine per vendor instructions, as CISA requires.\nunknown","reach":"internet","impact":"high","summary":"Microsoft Internet Explorer's scripting engine mishandles objects in memory, causing memory corruption. An attacker who gets a user to load a crafted web page can run code on that user's machine.","category":"runtime","who_cares":["windows","internet-explorer","endpoints"],"confidence":0.7,"needs_auth":"no","worst_case":"Attacker runs code as the logged-in user on the victim machine.","analyst_note":"Confirm the affected Windows and IE versions and the exact patch KB from the Microsoft advisory for CVE-2018-8653 (the sources here do not list them).","how_to_check":"Check whether Internet Explorer is installed and enabled on Windows endpoints, for example with the Windows optional features list or by looking for iexplore.exe.\nunknown\nunknown","needs_analyst":true,"not_affected_if":["no-ie-installed","ie-disabled"],"user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.00049,"input_tokens":2849,"output_tokens":411,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2018':13A,16A,105C '-8643':106C '-8653':14A,17A '10':97C '11':94C '9':91C 'affect':88C 'aka':81C 'attack':42B 'caus':38B 'code':55B,63C 'corrupt':10A,40B,85C 'craft':50B 'cve':12A,15A,99C,104C 'endpoint':21B 'engin':8A,33B,73C,83C 'execut':64C 'exist':66C 'exploit':22B 'explor':3A,6A,25B,30B,80C,90C,93C,96C 'explorer':20A 'get':44B 'handl':74C 'id':100C 'internet':2A,5A,19A,24B,29B,79C,89C,92C,95C 'internet-explor':23B 'load':48B 'machin':60B 'memori':9A,37B,39B,77C,84C 'microsoft':1A,4A,18A,28B 'mishandl':34B 'object':35B,75C 'page':52B 'remot':62C 'run':54B 'runtim':26B 'script':7A,32B,72C,82C 'uniqu':102C 'user':46B,58B 'vulner':11A,65C,86C 'way':69C 'web':51B 'window':27B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2018-12-20T13:29:00+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-2018-8653","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-8653","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":"2026-10-25T17:39:59+00:00","note":null},{"source":"epss","external_id":"CVE-2018-8653","url":"https://api.first.org/data/v1/epss?cve=CVE-2018-8653","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-2018-8653","url":"https://nvd.nist.gov/vuln/detail/CVE-2018-8653","severity":null,"published_at":"2018-12-20T13:29:00+00:00","modified_at":"2026-06-17T02:05:15+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"}