{"id":"CVE-2021-31199","kind":"vulnerability","aliases":["CVE-2021-31199"],"related":[],"title":"Microsoft Enhanced Cryptographic Provider: Microsoft Enhanced Cryptographic Provider Privilege Escalation Vulnerability","description":"Microsoft Enhanced Cryptographic Provider contains an unspecified vulnerability that allows for privilege escalation.\n\nCISA required action: Apply updates per vendor instructions.","summary":"Microsoft Enhanced Cryptographic Provider, a Windows cryptographic library, has an unspecified flaw that lets a local user escalate privileges. CISA lists it as actively exploited in the wild.","severity":"high","cvss":7.8,"epss":0.02954,"exploited":true,"exploited_at":"2021-11-03T00:00:00+00:00","products":[{"name":"Microsoft Enhanced Cryptographic Provider","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","infrastructure","windows"],"not_affected_if":["unknown"],"how_to_check":null,"fix":"Apply Microsoft's updates per vendor instructions, as CISA's required action states; the specific patch version is unknown from the sources.","status":"open","published_at":"2021-06-08T23:15:08+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:39:28+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T21:39:28Z","model":"claude-haiku-5-5","output":{"fix":"Apply Microsoft's updates per vendor instructions, as CISA's required action states; the specific patch version is unknown from the sources.","reach":"local","impact":"high","summary":"Microsoft Enhanced Cryptographic Provider, a Windows cryptographic library, has an unspecified flaw that lets a local user escalate privileges. CISA lists it as actively exploited in the wild.","category":"infrastructure","who_cares":["windows"],"confidence":0.6,"needs_auth":"yes","worst_case":"Local attacker gains elevated system privileges on the Windows machine.","analyst_note":"Find Microsoft's security update guide entry for CVE-2021-31199 to confirm affected Windows builds, patch KB numbers and any detection steps.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["unknown"],"user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000454,"input_tokens":2853,"output_tokens":337,"severity_before":"unknown"},"analyst_status":"queued","analyst_note":"Find Microsoft's security update guide entry for CVE-2021-31199 to confirm affected Windows builds, patch KB numbers and any detection steps.","search":"'-2021':13A,16A '-31199':14A,17A 'action':68C 'activ':48B 'allow':62C 'appli':69C 'cisa':44B,66C 'contain':57C 'cryptograph':3A,7A,27B,31B,55C 'cryptographic':20A 'cve':12A,15A 'enhanc':2A,6A,26B,54C 'enhanced':19A 'escal':10A,42B,65C 'exploit':22B,49B 'flaw':36B 'infrastructur':23B 'instruct':73C 'let':38B 'librari':32B 'list':45B 'local':40B 'microsoft':1A,5A,18A,25B,53C 'per':71C 'privileg':9A,43B,64C 'provid':4A,8A,28B,56C 'provider':21A 'requir':67C 'unspecifi':35B,59C 'updat':70C 'user':41B 'vendor':72C 'vulner':11A,60C 'wild':52B 'window':24B,30B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2021-06-08T23:15:08+00:00","kev":{"dateAdded":"2021-11-03","dueDate":"2021-11-17","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N","cvss_by":"secure@microsoft.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2021-31199","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2021-31199","severity":null,"published_at":"2021-11-03T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:53+00:00","fetched_at":"2026-10-25T11:39:18+00:00","note":null},{"source":"epss","external_id":"CVE-2021-31199","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-31199","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-2021-31199","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31199","severity":null,"published_at":"2021-06-08T23:15:08+00:00","modified_at":"2026-06-17T03:51:26+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"}