{"id":"CVE-2025-30400","kind":"vulnerability","aliases":["CVE-2025-30400"],"related":[],"title":"Use after free in Windows DWM allows an authorized attacker to elevate privileges locally","description":"Microsoft Windows DWM Core Library contains a use-after-free vulnerability that allows an authorized attacker to elevate privileges locally.\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 Desktop Window Manager (DWM) Core Library has a use-after-free bug that lets an authorized local user raise their privileges. Attackers exploit this in the wild, and CISA lists it in the Known Exploited Vulnerabilities catalog.","severity":"high","cvss":7.8,"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 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 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","multi-user-systems","windows","windows-servers"],"not_affected_if":["fully-patched-windows","non-windows"],"how_to_check":null,"fix":"Apply the Microsoft security update for CVE-2025-30400 on affected Windows builds; check Microsoft's advisory for the exact KB. Follow the vendor mitigations per CISA's required action.","status":"open","published_at":"2025-05-13T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:48:36+00:00","updated_at":"2026-10-23T22:29:05+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T20:48:36Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft security update for CVE-2025-30400 on affected Windows builds; check Microsoft's advisory for the exact KB. Follow the vendor mitigations per CISA's required action.","reach":"local","summary":"Microsoft Windows Desktop Window Manager (DWM) Core Library has a use-after-free bug that lets an authorized local user raise their privileges. Attackers exploit this in the wild, and CISA lists it in the Known Exploited Vulnerabilities catalog.","category":"infrastructure","who_cares":["windows","windows-servers","multi-user-systems"],"confidence":0.6,"needs_auth":"yes","worst_case":"A low-privileged local user gains SYSTEM-level control of the Windows machine.","analyst_note":"Sources do not list affected or fixed Windows builds or KB numbers; check the Microsoft Security Update Guide entry for CVE-2025-30400.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["fully-patched-windows","non-windows"],"user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000454,"input_tokens":2531,"output_tokens":401,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-01':147C '-2025':16A,19A '-30400':17A,20A '10':25A,29A,33A '11':37A,41A,45A '1809':26A '2019':50A '2022':54A,58A '2025':63A '21h2':30A '22':146C '22h2':34A,38A '23h2':42A,59A '24h2':46A 'action':137C 'allow':7A,127C 'appli':138C 'applic':144C 'attack':10A,98B,130C 'author':9A,92B,129C 'bod':145C 'bug':88B 'catalog':113B 'cisa':105B,135C 'cloud':150C 'contain':119C 'core':80B,117C 'cve':15A,18A 'desktop':76B 'discontinu':153C 'dwm':6A,79B,116C 'elev':12A,132C 'exploit':64B,99B,111B 'follow':143C 'free':3A,87B,124C 'guidanc':148C 'infrastructur':65B 'instruct':142C 'known':110B 'let':90B 'librari':81B,118C 'list':106B 'local':14A,93B,134C 'manag':78B 'microsoft':21A,23A,27A,31A,35A,39A,43A,47A,51A,55A,60A,74B,114C 'mitig':139C,159C 'multi':67B 'multi-user-system':66B 'per':140C 'privileg':13A,97B,133C 'product':157C 'rais':95B 'requir':136C 'server':49A,53A,57A,62A,73B 'servic':151C 'system':69B 'unavail':161C 'use':1A,85B,122C,154C 'use-after-fre':84B,121C 'user':68B,94B 'vendor':141C 'vulner':112B,125C 'wild':103B 'window':5A,70B,72B,75B,77B,115C 'windows':22A,24A,28A,32A,36A,40A,44A,48A,52A,56A,61A 'windows-serv':71B","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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2025-30400","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-30400","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":"2026-10-25T16:39:46+00:00","note":null},{"source":"nvd","external_id":"CVE-2025-30400","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-30400","severity":null,"published_at":"2025-05-13T17:16:02+00:00","modified_at":"2026-06-17T09:08:39+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"}