{"id":"CVE-2013-3893","kind":"vulnerability","aliases":["CVE-2013-3893"],"related":[],"title":"Use-after-free vulnerability in the SetMouseCapture implementation in mshtml.dll in Microsoft Internet Explorer 6…","description":"Microsoft Internet Explorer contains a memory corruption vulnerability that allows for remote code execution. The impacted products could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization.\n\nCISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","summary":"Microsoft Internet Explorer has a memory corruption flaw that lets a remote attacker run code on the victim's machine. CISA lists it as actively exploited in the wild.","severity":"critical","cvss":9.3,"epss":null,"exploited":true,"exploited_at":"2025-08-12T00:00:00+00:00","products":[{"name":"Microsoft Internet Explorer","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft internet explorer","fixed":[],"affected":"= 6","ecosystem":"vendor"},{"name":"microsoft internet explorer","fixed":[],"affected":"= 7","ecosystem":"vendor"},{"name":"microsoft internet explorer","fixed":[],"affected":"= 8","ecosystem":"vendor"},{"name":"microsoft internet explorer","fixed":[],"affected":"= 9","ecosystem":"vendor"},{"name":"microsoft internet explorer","fixed":[],"affected":"= 10","ecosystem":"vendor"},{"name":"microsoft internet explorer","fixed":[],"affected":"= 11","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","internet-explorer","other","windows"],"not_affected_if":["ie-removed","no-ie-installed"],"how_to_check":"Check whether any Internet Explorer version is installed or used as a browser on the team's machines, including IE as a rendering engine in legacy apps.","fix":"Discontinue Internet Explorer use and move to a supported browser; apply Microsoft's mitigations if IE must remain in use.","status":"open","published_at":"2013-09-18T10:08:24+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:46:35+00:00","updated_at":"2026-10-23T22:29:05+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-10-23T20:46:35Z","model":"claude-haiku-5-5","output":{"fix":"Discontinue Internet Explorer use and move to a supported browser; apply Microsoft's mitigations if IE must remain in use.","reach":"internet","summary":"Microsoft Internet Explorer has a memory corruption flaw that lets a remote attacker run code on the victim's machine. CISA lists it as actively exploited in the wild.","category":"other","who_cares":["internet-explorer","windows"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker runs arbitrary code on the victim's machine via a crafted web page.","analyst_note":"Sources do not list affected or fixed IE versions; check Microsoft's advisory for the CVE-2013-3893 patch and affected builds.","how_to_check":"Check whether any Internet Explorer version is installed or used as a browser on the team's machines, including IE as a rendering engine in legacy apps.","needs_analyst":true,"not_affected_if":["no-ie-installed","ie-removed"],"user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000444,"input_tokens":2566,"output_tokens":375,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':126C '-2013':18A,21A '-3893':19A,22A '22':125C '6':16A 'action':116C 'activ':74B 'allow':88C 'and/or':103C 'appli':117C 'applic':123C 'attack':62B 'bod':124C 'cisa':70B,114C 'cloud':129C 'code':64B,91C 'contain':82C 'corrupt':56B,85C 'could':96C 'cve':17A,20A 'discontinu':111C,132C 'end':99C,105C 'end-of-lif':98C 'end-of-servic':104C 'eo':108C 'eol':102C 'execut':92C 'exploit':44B,75B 'explor':15A,47B,52B,81C 'explorer':25A,28A,31A,34A,37A,40A,43A 'flaw':57B 'follow':122C 'free':4A 'guidanc':127C 'impact':94C 'implement':9A 'instruct':121C 'internet':14A,24A,27A,30A,33A,36A,39A,42A,46B,51B,80C 'internet-explor':45B 'let':59B 'life':101C 'list':71B 'machin':69B 'memori':55B,84C 'microsoft':13A,23A,26A,29A,32A,35A,38A,41A,50B,79C 'mitig':118C,138C 'mshtml.dll':11A 'per':119C 'product':95C,112C,136C 'remot':61B,90C 'requir':115C 'run':63B 'servic':107C,130C 'setmousecaptur':8A 'unavail':140C 'use':2A,133C 'use-after-fre':1A 'user':109C 'util':113C 'vendor':120C 'victim':67B 'vulner':5A,86C 'wild':78B 'window':49B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2013-09-18T10:08:24+00:00","kev":{"dateAdded":"2025-08-12","dueDate":"2025-09-02","requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"134c704f-9b21-4f2e-91b3-4a467353bcc0","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2013-3893","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2013-3893","severity":null,"published_at":"2025-08-12T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T10:39:04+00:00","note":null},{"source":"nvd","external_id":"CVE-2013-3893","url":"https://nvd.nist.gov/vuln/detail/CVE-2013-3893","severity":null,"published_at":"2013-09-18T10:08:24+00:00","modified_at":"2026-06-16T23:55:58+00:00","first_seen_at":"2026-10-23T22:29:05+00:00","fetched_at":"2026-10-23T22:29:05+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"}