{"id":"CVE-2016-0099","kind":"vulnerability","aliases":["CVE-2016-0099"],"related":[],"title":"Microsoft Windows: Microsoft Windows Secondary Logon Service Privilege Escalation Vulnerability","description":"The Secondary Logon Service in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, and Windows 10 Gold and 1511 does not properly process request handles, which allows local users to gain privileges via a crafted application, aka \"Secondary Logon Elevation of Privilege Vulnerability.\"","summary":"Windows Secondary Logon Service mishandles request handles in memory, allowing local privilege escalation. An attacker who already has a local foothold can run arbitrary code as an administrator.","severity":"high","cvss":7.8,"epss":0.37045,"exploited":true,"exploited_at":"2022-03-03T00:00:00+00:00","products":[{"name":"Microsoft Windows","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","ransomware","self-hosted","windows"],"not_affected_if":["patched-systems"],"how_to_check":null,"fix":"Apply the Microsoft security update for CVE-2016-0099 per vendor instructions (CISA KEV required action). Specific KB numbers are unknown from the sources.","status":"open","published_at":"2016-03-09T11:59:09+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:26:15+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-10-23T21:26:15Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft security update for CVE-2016-0099 per vendor instructions (CISA KEV required action). Specific KB numbers are unknown from the sources.","reach":"local","impact":"high","summary":"Windows Secondary Logon Service mishandles request handles in memory, allowing local privilege escalation. An attacker who already has a local foothold can run arbitrary code as an administrator.","category":"infrastructure","who_cares":["windows","self-hosted"],"confidence":0.7,"needs_auth":"yes","worst_case":"Local user gains administrator rights and runs arbitrary code.","analyst_note":"Confirm affected Windows builds and KB numbers from the Microsoft MS16-032 bulletin; sources give no version list or check method.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["patched-systems"],"user_interaction":"no","needs_special_setup":"no","severity_if_unknown":"high"},"cost_usd":0.000455,"input_tokens":2874,"output_tokens":336,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-0099':13A,16A '-2016':12A,15A '10':86C '1511':89C '2008':65C '2012':77C '7':71C '8.1':74C,83C 'administr':53B 'aka':107C 'allow':35B,97C 'alreadi':42B 'applic':106C 'arbitrari':49B 'attack':40B 'code':50B 'craft':105C 'cve':11A,14A 'elev':110C 'escal':9A,38B 'exploit':19B 'foothold':46B 'gain':101C 'gold':78C,87C 'handl':32B,95C 'host':24B 'infrastructur':20B 'local':36B,45B,98C 'logon':6A,28B,56C,109C 'memori':34B 'microsoft':1A,3A,17A,59C 'mishandl':30B 'privileg':8A,37B,102C,112C 'process':93C 'proper':92C 'r2':68C,80C 'ransomwar':21B 'request':31B,94C 'rt':82C 'run':48B 'secondari':5A,27B,55C,108C 'self':23B 'self-host':22B 'server':64C,76C 'servic':7A,29B,57C 'sp1':69C,72C 'sp2':62C,66C 'user':99C 'via':103C 'vista':61C 'vulner':10A,113C 'window':2A,4A,25B,26B,60C,63C,70C,73C,75C,81C,85C 'windows':18A","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2016-03-09T11:59:09+00:00","kev":{"dateAdded":"2022-03-03","dueDate":"2022-03-24","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2016-0099","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2016-0099","severity":null,"published_at":"2022-03-03T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T13:39:32+00:00","note":null},{"source":"epss","external_id":"CVE-2016-0099","url":"https://api.first.org/data/v1/epss?cve=CVE-2016-0099","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:44+00:00","fetched_at":"2026-10-23T19:13:44+00:00","note":null},{"source":"nvd","external_id":"CVE-2016-0099","url":"https://nvd.nist.gov/vuln/detail/CVE-2016-0099","severity":null,"published_at":"2016-03-09T11:59:09+00:00","modified_at":"2026-06-17T00:36:55+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+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"}