{"id":"CVE-2018-8373","kind":"vulnerability","aliases":["CVE-2018-8373"],"related":[],"title":"Microsoft Internet Explorer Scripting Engine: Microsoft 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-2018-8353, CVE-2018-8355, CVE-2018-8359, CVE-2018-8371, CVE-2018-8372, CVE-2018-8385, CVE-2018-8389, CVE-2018-8390.","summary":"A memory corruption flaw in the Internet Explorer scripting engine lets a crafted web page run code. CISA lists it as actively exploited.","severity":"high","cvss":7.6,"epss":0.61511,"exploited":true,"exploited_at":"2022-03-25T00:00:00+00:00","products":[{"name":"Microsoft Internet Explorer Scripting Engine","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","internet-explorer","windows"],"not_affected_if":["no-internet-explorer-installed"],"how_to_check":null,"fix":"Apply the Microsoft updates for this CVE per vendor instructions; the specific patched builds are not stated in the sources.","status":"open","published_at":"2018-08-15T17:29:06+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:20:11+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-10-23T21:20:11Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft updates for this CVE per vendor instructions; the specific patched builds are not stated in the sources.","reach":"internet","impact":"high","summary":"A memory corruption flaw in the Internet Explorer scripting engine lets a crafted web page run code. CISA lists it as actively exploited.","category":"infrastructure","who_cares":["windows","internet-explorer"],"confidence":0.7,"needs_auth":"no","worst_case":"Attacker runs code as the logged-in user after a victim visits a page","analyst_note":"Confirm patched Windows builds and whether IE mode in Edge is affected, using the Microsoft advisory for CVE-2018-8373 and the CISA KEV entry.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["no-internet-explorer-installed"],"user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000449,"input_tokens":2842,"output_tokens":330,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2018':13A,16A,96C,99C,102C,105C,108C,111C,114C,117C '-8353':97C '-8355':100C '-8359':103C '-8371':106C '-8372':109C '-8373':14A,17A '-8385':112C '-8389':115C '-8390':118C '10':88C '11':85C '9':82C 'activ':50B 'affect':79C 'aka':72C 'cisa':46B 'code':45B,54C 'corrupt':10A,31B,76C 'craft':41B 'cve':12A,15A,90C,95C,98C,101C,104C,107C,110C,113C,116C 'engin':5A,8A,38B,64C,74C 'engine':22A 'execut':55C 'exist':57C 'exploit':23B,51B 'explor':3A,27B,36B,71C,81C,84C,87C 'explorer':20A 'flaw':32B 'handl':65C 'id':91C 'infrastructur':24B 'internet':2A,19A,26B,35B,70C,80C,83C,86C 'internet-explor':25B 'let':39B 'list':47B 'memori':9A,30B,68C,75C 'microsoft':1A,6A,18A 'object':66C 'page':43B 'remot':53C 'run':44B 'script':4A,7A,37B,63C,73C 'scripting':21A 'uniqu':93C 'vulner':11A,56C,77C 'way':60C 'web':42B 'window':28B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2018-08-15T17:29:06+00:00","kev":{"dateAdded":"2022-03-25","dueDate":"2022-04-15","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-2018-8373","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-8373","severity":null,"published_at":"2022-03-25T00:00:00+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-2018-8373","url":"https://api.first.org/data/v1/epss?cve=CVE-2018-8373","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-2018-8373","url":"https://nvd.nist.gov/vuln/detail/CVE-2018-8373","severity":null,"published_at":"2018-08-15T17:29:06+00:00","modified_at":"2026-06-17T02:04:43+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"}