{"id":"CVE-2023-24880","kind":"vulnerability","aliases":["CVE-2023-24880"],"related":[],"title":"Windows SmartScreen Security Feature Bypass Vulnerability","description":"Microsoft Windows SmartScreen contains a security feature bypass vulnerability that could allow an attacker to evade Mark of the Web (MOTW) defenses via a specially crafted malicious file.\n\nCISA required action: Apply updates per vendor instructions.","summary":"Microsoft Windows SmartScreen has a security feature bypass that lets a specially crafted malicious file evade Mark of the Web warnings. CISA lists it as actively exploited, with ransomware use tagged in the catalog.","severity":"high","cvss":4.4,"epss":null,"exploited":true,"exploited_at":"2023-03-14T00:00:00+00:00","products":[{"name":"Microsoft Windows","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows 10 1607","fixed":["10.0.14393.5786"],"affected":"< 10.0.14393.5786","ecosystem":"vendor"},{"name":"microsoft windows 10 1809","fixed":["10.0.17763.4131"],"affected":"< 10.0.17763.4131","ecosystem":"vendor"},{"name":"microsoft windows 10 20h2","fixed":["10.0.19042.2728"],"affected":"< 10.0.19042.2728","ecosystem":"vendor"},{"name":"microsoft windows 10 21h2","fixed":["10.0.19044.2728"],"affected":"< 10.0.19044.2728","ecosystem":"vendor"},{"name":"microsoft windows 10 22h2","fixed":["10.0.19045.2728"],"affected":"< 10.0.19045.2728","ecosystem":"vendor"},{"name":"microsoft windows 11 21h2","fixed":["10.0.22000.1696"],"affected":"< 10.0.22000.1696","ecosystem":"vendor"},{"name":"microsoft windows 11 22h2","fixed":["10.0.22000.1413"],"affected":"< 10.0.22000.1413","ecosystem":"vendor"},{"name":"microsoft windows server 2016","fixed":["10.0.14393.5786"],"affected":"< 10.0.14393.5786","ecosystem":"vendor"},{"name":"microsoft windows server 2019","fixed":["10.0.17763.4131"],"affected":"< 10.0.17763.4131","ecosystem":"vendor"},{"name":"microsoft windows server 2022","fixed":["10.0.20348.1602"],"affected":"< 10.0.20348.1602","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","ransomware","windows"],"not_affected_if":["unknown"],"how_to_check":null,"fix":"Apply the Microsoft Windows updates per vendor instructions; the specific patched build is not in the sources.","status":"open","published_at":"2023-03-14T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:08:32+00:00","updated_at":"2026-10-23T22:29:04+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T21:08:32Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft Windows updates per vendor instructions; the specific patched build is not in the sources.","reach":"local","impact":"high","summary":"Microsoft Windows SmartScreen has a security feature bypass that lets a specially crafted malicious file evade Mark of the Web warnings. CISA lists it as actively exploited, with ransomware use tagged in the catalog.","category":"infrastructure","who_cares":["windows"],"confidence":0.6,"needs_auth":"no","worst_case":"Malicious file bypasses SmartScreen warnings, enabling code execution on the user's Windows machine.","analyst_note":"Find the Microsoft advisory for CVE-2023-24880 to get patched builds and detection steps for the KEV entry.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["unknown"],"user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000449,"input_tokens":2817,"output_tokens":334,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2023':8A,11A '-24880':9A,12A '10':17A,21A,25A,29A,33A '11':37A,41A '1607':18A '1809':22A '2016':46A '2019':50A '2022':54A '20h2':26A '21h2':30A,38A '22h2':34A,42A 'action':123C 'activ':84B 'allow':104C 'appli':124C 'attack':106C 'bypass':5A,66B,100C 'catalog':92B 'cisa':80B,121C 'contain':96C 'could':103C 'craft':71B,118C 'cve':7A,10A 'defens':114C 'evad':74B,108C 'exploit':55B,85B 'featur':4A,65B,99C 'file':73B,120C 'infrastructur':56B 'instruct':128C 'let':68B 'list':81B 'malici':72B,119C 'mark':75B,109C 'microsoft':13A,15A,19A,23A,27A,31A,35A,39A,43A,47A,51A,59B,93C 'motw':113C 'per':126C 'ransomwar':57B,87B 'requir':122C 'secur':3A,64B,98C 'server':45A,49A,53A 'smartscreen':2A,61B,95C 'special':70B,117C 'tag':89B 'updat':125C 'use':88B 'vendor':127C 'via':115C 'vulner':6A,101C 'warn':79B 'web':78B,112C 'window':1A,58B,60B,94C 'windows':14A,16A,20A,24A,28A,32A,36A,40A,44A,48A,52A","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2023-03-14T00:00:00+00:00","kev":{"dateAdded":"2023-03-14","dueDate":"2023-04-04","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2023-24880","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-24880","severity":null,"published_at":"2023-03-14T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T17:39:57+00:00","note":null},{"source":"nvd","external_id":"CVE-2023-24880","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-24880","severity":null,"published_at":"2023-03-14T17:15:17+00:00","modified_at":"2026-06-17T05:40:10+00:00","first_seen_at":"2026-10-23T22:29:04+00:00","fetched_at":"2026-10-23T22:29:04+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"}