{"id":"CVE-2024-21412","kind":"vulnerability","aliases":["CVE-2024-21412"],"related":[],"title":"Internet Shortcut Files Security Feature Bypass Vulnerability","description":"Microsoft Windows Internet Shortcut Files contains an unspecified vulnerability that allows for a security feature bypass.\n\nCISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","summary":"Windows Internet Shortcut (.url) files can bypass a Windows security feature, so a crafted shortcut opens without the usual warning. CISA lists it as exploited in the wild, and the sources tie it to ransomware campaigns.","severity":"high","cvss":8.1,"epss":null,"exploited":true,"exploited_at":"2024-02-13T00:00:00+00:00","products":[{"name":"Microsoft Windows","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows 10 1809","fixed":["10.0.17763.5458"],"affected":"< 10.0.17763.5458","ecosystem":"vendor"},{"name":"microsoft windows 10 21h2","fixed":["10.0.19044.4046"],"affected":"< 10.0.19044.4046","ecosystem":"vendor"},{"name":"microsoft windows 10 22h2","fixed":["10.0.19045.4046"],"affected":"< 10.0.19045.4046","ecosystem":"vendor"},{"name":"microsoft windows 11 21h2","fixed":["10.0.22000.2777"],"affected":"< 10.0.22000.2777","ecosystem":"vendor"},{"name":"microsoft windows 11 22h2","fixed":["10.0.22621.3155"],"affected":"< 10.0.22621.3155","ecosystem":"vendor"},{"name":"microsoft windows 11 23h2","fixed":["10.0.22631.3155"],"affected":"< 10.0.22631.3155","ecosystem":"vendor"},{"name":"microsoft windows server 2019","fixed":["10.0.17763.5458"],"affected":"< 10.0.17763.5458","ecosystem":"vendor"},{"name":"microsoft windows server 2022","fixed":["10.0.20348.2322"],"affected":"< 10.0.20348.2322","ecosystem":"vendor"},{"name":"microsoft windows server 2022 23h2","fixed":["10.0.25398.709"],"affected":"< 10.0.25398.709","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["endpoints","exploited","infrastructure","ransomware","windows"],"not_affected_if":["unknown"],"how_to_check":"Check that the Microsoft February 2024 security update (KB for CVE-2024-21412) is installed on each Windows host; unknown exact KB and build numbers from the sources.","fix":"Install the Microsoft security update that addresses CVE-2024-21412 on all Windows systems; if unavailable, follow Microsoft's vendor mitigation guidance or stop using the affected product.","status":"open","published_at":"2024-02-13T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T21:02:20+00:00","updated_at":"2026-10-23T22:29:05+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T21:02:20Z","model":"claude-haiku-5-5","output":{"fix":"Install the Microsoft security update that addresses CVE-2024-21412 on all Windows systems; if unavailable, follow Microsoft's vendor mitigation guidance or stop using the affected product.","reach":"network","impact":"high","summary":"Windows Internet Shortcut (.url) files can bypass a Windows security feature, so a crafted shortcut opens without the usual warning. CISA lists it as exploited in the wild, and the sources tie it to ransomware campaigns.","category":"infrastructure","who_cares":["windows","endpoints"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker bypasses Windows warnings and runs malicious code from a crafted shortcut file.","analyst_note":"Confirm the exact patched Windows builds and KB numbers from Microsoft's CVE-2024-21412 advisory, and the vendor mitigation steps, since the sources give neither.","how_to_check":"Check that the Microsoft February 2024 security update (KB for CVE-2024-21412) is installed on each Windows host; unknown exact KB and build numbers from the sources.","needs_analyst":true,"not_affected_if":["unknown"],"user_interaction":"yes","needs_special_setup":"no","severity_if_unknown":"unknown"},"cost_usd":0.000504,"input_tokens":2817,"output_tokens":444,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2024':9A,12A '-21412':10A,13A '10':18A,22A,26A '11':30A,34A,38A '1809':19A '2019':43A '2022':47A,51A '21h2':23A,31A '22h2':27A,35A '23h2':39A,52A 'action':112C 'allow':104C 'appli':113C 'bypass':6A,64B,109C 'campaign':93B 'cisa':78B,110C 'contain':99C 'craft':71B 'cve':8A,11A 'discontinu':119C 'endpoint':53B 'exploit':54B,82B 'featur':5A,68B,108C 'file':3A,62B,98C 'infrastructur':55B 'instruct':117C 'internet':1A,59B,96C 'list':79B 'microsoft':14A,16A,20A,24A,28A,32A,36A,40A,44A,48A,94C 'mitig':114C,125C 'open':73B 'per':115C 'product':123C 'ransomwar':56B,92B 'requir':111C 'secur':4A,67B,107C 'server':42A,46A,50A 'shortcut':2A,60B,72B,97C 'sourc':88B 'tie':89B 'unavail':127C 'unspecifi':101C 'url':61B 'use':120C 'usual':76B 'vendor':116C 'vulner':7A,102C 'warn':77B 'wild':85B 'window':57B,58B,66B,95C 'windows':15A,17A,21A,25A,29A,33A,37A,41A,45A,49A 'without':74B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2024-02-13T00:00:00+00:00","kev":{"dateAdded":"2024-02-13","dueDate":"2024-03-05","requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2024-21412","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2024-21412","severity":null,"published_at":"2024-02-13T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T14:39:39+00:00","note":null},{"source":"nvd","external_id":"CVE-2024-21412","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-21412","severity":null,"published_at":"2024-02-13T18:15:59+00:00","modified_at":"2026-08-10T16:18:51+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"}