{"id":"CVE-2026-105561","kind":"vulnerability","aliases":["CVE-2026-105561"],"related":[],"title":"Windows SSTP: uncontrolled resource use lets an attacker deny service","description":"Uncontrolled resource consumption in Windows Secure Socket Tunneling Protocol (SSTP) allows an unauthorized attacker to deny service over a network.","summary":"Windows' Secure Socket Tunneling Protocol (SSTP) VPN service can be made to consume resources without limit. An unauthenticated attacker on the network can exhaust the machine and take the service down.","severity":"high","cvss":7.5,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["infrastructure","sstp","vpn","windows"],"not_affected_if":[],"how_to_check":null,"fix":null,"status":"open","published_at":"2026-11-10T19:17:58+00:00","first_seen_at":"2026-11-10T19:24:20+00:00","triaged_at":"2026-11-10T19:47:28+00:00","updated_at":"2026-11-10T19:47:28+00:00","category":"infrastructure","confidence":0.5,"triage":{"at":"2026-11-10T19:47:28Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"Windows SSTP: uncontrolled resource use lets an attacker deny service","impact":"low","summary":"Windows' Secure Socket Tunneling Protocol (SSTP) VPN service can be made to consume resources without limit. An unauthenticated attacker on the network can exhaust the machine and take the service down.","audience":"businesses","category":"infrastructure","nicknames":[],"who_cares":["windows","sstp","vpn"],"confidence":0.5,"fix_status":"unknown","needs_auth":"unknown","worst_case":"Remote denial of service against a Windows SSTP VPN endpoint","analyst_note":"Find the Microsoft advisory for CVE-2026-105561 for affected Windows builds, whether SSTP Remote Access must be enabled, and the fixed update.","how_to_check":"unknown","plain_action":"","product_name":"Windows SSTP","needs_analyst":true,"not_affected_if":[],"who_is_affected":"unknown","user_interaction":"no","product_ecosystem":"vendor","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000655,"input_tokens":4520,"output_tokens":406,"severity_before":"high"},"analyst_status":"queued","analyst_note":"Find the Microsoft advisory for CVE-2026-105561 for affected Windows builds, whether SSTP Remote Access must be enabled, and the fixed update.","search":"'-105561':13A,16A '-2026':12A,15A 'allow':61C 'attack':8A,39B,64C 'consum':33B 'consumpt':53C 'cve':11A,14A 'deni':9A,66C 'exhaust':44B 'infrastructur':17B 'let':6A 'limit':36B 'machin':46B 'made':31B 'network':42B,70C 'protocol':25B,59C 'resourc':4A,34B,52C 'secur':22B,56C 'servic':10A,28B,50B,67C 'socket':23B,57C 'sstp':2A,18B,26B,60C 'take':48B 'tunnel':24B,58C 'unauthent':38B 'unauthor':63C 'uncontrol':3A,51C 'use':5A 'vpn':19B,27B 'window':1A,20B,21B,55C 'without':35B","nicknames":[],"mitigations":[],"who_affected":null,"tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["high","infrastructure","sstp","vpn","windows"],"campaign_type":null,"search_a":"'-105561':13A,16A '-2026':12A,15A 'attack':8A 'cve':11A,14A 'deni':9A 'let':6A 'resourc':4A 'servic':10A 'sstp':2A 'uncontrol':3A 'use':5A 'window':1A","search_b":"'attack':39B 'consum':33B 'exhaust':44B 'infrastructur':17B 'limit':36B 'machin':46B 'made':31B 'network':42B 'protocol':25B 'resourc':34B 'secur':22B 'servic':28B,50B 'socket':23B 'sstp':18B,26B 'take':48B 'tunnel':24B 'unauthent':38B 'vpn':19B,27B 'window':20B,21B 'without':35B","search_c":"'allow':61C 'attack':64C 'consumpt':53C 'deni':66C 'network':70C 'protocol':59C 'resourc':52C 'secur':56C 'servic':67C 'socket':57C 'sstp':60C 'tunnel':58C 'unauthor':63C 'uncontrol':51C 'window':55C","cause_entry":null,"cause_path":null,"disclosures_checked_at":null,"first_public_at":"2026-11-10T19:17:58+00:00","kev":null,"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-105561","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-105561","severity":null,"published_at":"2026-11-10T19:17:58+00:00","modified_at":"2026-11-10T19:17:58+00:00","first_seen_at":"2026-11-10T19:24:20+00:00","fetched_at":"2026-11-10T19:24:20+00:00","note":null}],"documents":[],"disclosures":[],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}