{"id":"CVE-2025-30397","kind":"vulnerability","aliases":["CVE-2025-30397"],"related":[],"title":"Access of resource using incompatible type ('type confusion') in Microsoft Scripting Engine allows an unauthorized…","description":"Microsoft Windows Scripting Engine contains a type confusion vulnerability that allows an unauthorized attacker to execute code over a network via a specially crafted URL.\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 Windows Scripting Engine has a type confusion bug that lets a remote attacker run code on the machine. The attacker only needs to get a victim to load a specially crafted URL.","severity":"critical","cvss":7.5,"epss":null,"exploited":true,"exploited_at":"2025-05-13T00:00:00+00:00","products":[{"name":"Microsoft Windows","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows 10 1507","fixed":["10.0.10240.21014"],"affected":"< 10.0.10240.21014","ecosystem":"vendor"},{"name":"microsoft windows 10 1607","fixed":["10.0.14393.8066"],"affected":"< 10.0.14393.8066","ecosystem":"vendor"},{"name":"microsoft windows 10 1809","fixed":["10.0.17763.7314"],"affected":"< 10.0.17763.7314","ecosystem":"vendor"},{"name":"microsoft windows 10 21h2","fixed":["10.0.19044.5854"],"affected":"< 10.0.19044.5854","ecosystem":"vendor"},{"name":"microsoft windows 10 22h2","fixed":["10.0.19045.5854"],"affected":"< 10.0.19045.5854","ecosystem":"vendor"},{"name":"microsoft windows 11 22h2","fixed":["10.0.22621.5335"],"affected":"< 10.0.22621.5335","ecosystem":"vendor"},{"name":"microsoft windows 11 23h2","fixed":["10.0.22631.5335"],"affected":"< 10.0.22631.5335","ecosystem":"vendor"},{"name":"microsoft windows 11 24h2","fixed":["10.0.26100.3981"],"affected":"< 10.0.26100.3981","ecosystem":"vendor"},{"name":"microsoft windows server 2008","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows server 2008","fixed":[],"affected":"= r2","ecosystem":"vendor"},{"name":"microsoft windows server 2012","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"microsoft windows server 2012","fixed":[],"affected":"= r2","ecosystem":"vendor"},{"name":"microsoft windows server 2016","fixed":["10.0.14393.8066"],"affected":"< 10.0.14393.8066","ecosystem":"vendor"},{"name":"microsoft windows server 2019","fixed":["10.0.17763.7314"],"affected":"< 10.0.17763.7314","ecosystem":"vendor"},{"name":"microsoft windows server 2022","fixed":["10.0.20348.3692"],"affected":"< 10.0.20348.3692","ecosystem":"vendor"},{"name":"microsoft windows server 2022 23h2","fixed":["10.0.25398.1611"],"affected":"< 10.0.25398.1611","ecosystem":"vendor"},{"name":"microsoft windows server 2025","fixed":["10.0.26100.3981"],"affected":"< 10.0.26100.3981","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","internet-facing","microsoft-windows","windows"],"not_affected_if":["fully-patched-windows"],"how_to_check":null,"fix":"Apply the Microsoft security update for CVE-2025-30397 on all affected Windows systems. Follow the CISA required action: apply vendor mitigations or discontinue use if mitigations are unavailable.","status":"open","published_at":"2025-05-13T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:48:34+00:00","updated_at":"2026-10-23T22:29:05+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T20:48:34Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft security update for CVE-2025-30397 on all affected Windows systems. Follow the CISA required action: apply vendor mitigations or discontinue use if mitigations are unavailable.","reach":"internet","summary":"Microsoft Windows Scripting Engine has a type confusion bug that lets a remote attacker run code on the machine. The attacker only needs to get a victim to load a specially crafted URL.","category":"infrastructure","who_cares":["windows","microsoft-windows","internet-facing"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker runs arbitrary code on the victim's Windows machine after a crafted URL is opened.","analyst_note":"Find the Microsoft Security Update Guide entry for CVE-2025-30397 to confirm affected Windows builds, the patch KB, and the exact URL-handling attack path.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["fully-patched-windows"],"user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000447,"input_tokens":2538,"output_tokens":386,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':172C '-2025':17A,20A '-30397':18A,21A '10':26A,30A,34A,38A,42A '11':46A,50A,54A '1507':27A '1607':31A '1809':35A '2008':59A,63A '2012':67A,71A '2016':75A '2019':79A '2022':83A,87A '2025':92A '21h2':39A '22':171C '22h2':43A,47A '23h2':51A,88A '24h2':55A 'access':1A 'action':162C 'allow':13A,145C 'appli':163C 'applic':169C 'attack':115B,122B,148C 'bod':170C 'bug':110B 'cisa':160C 'cloud':175C 'code':117B,151C 'confus':8A,109B,142C 'contain':139C 'craft':133B,158C 'cve':16A,19A 'discontinu':178C 'engin':12A,105B,138C 'execut':150C 'exploit':93B 'face':97B 'follow':168C 'get':126B 'guidanc':173C 'incompat':5A 'infrastructur':94B 'instruct':167C 'internet':96B 'internet-fac':95B 'let':112B 'load':130B 'machin':120B 'microsoft':10A,22A,24A,28A,32A,36A,40A,44A,48A,52A,56A,60A,64A,68A,72A,76A,80A,84A,89A,99B,102B,135C 'microsoft-window':98B 'mitig':164C,184C 'need':124B 'network':154C 'per':165C 'product':182C 'remot':114B 'requir':161C 'resourc':3A 'run':116B 'script':11A,104B,137C 'server':58A,62A,66A,70A,74A,78A,82A,86A,91A 'servic':176C 'special':132B,157C 'type':6A,7A,108B,141C 'unauthor':15A,147C 'unavail':186C 'url':134B,159C 'use':4A,179C 'vendor':166C 'via':155C 'victim':128B 'vulner':143C 'window':100B,101B,103B,136C 'windows':23A,25A,29A,33A,37A,41A,45A,49A,53A,57A,61A,65A,69A,73A,77A,81A,85A,90A","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2025-05-13T00:00:00+00:00","kev":{"dateAdded":"2025-05-13","dueDate":"2025-06-03","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:H/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2025-30397","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-30397","severity":null,"published_at":"2025-05-13T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T20:35:32+00:00","note":null},{"source":"nvd","external_id":"CVE-2025-30397","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-30397","severity":null,"published_at":"2025-05-13T17:16:02+00:00","modified_at":"2026-06-17T09:08:38+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"}