{"id":"CVE-2017-8759","kind":"vulnerability","aliases":["CVE-2017-8759"],"related":[],"title":"Microsoft .NET Framework: Microsoft .NET Framework Remote Code Execution Vulnerability","description":"Microsoft .NET Framework contains a remote code execution vulnerability when processing untrusted input that could allow an attacker to take control of an affected system.\n\nCISA required action: Apply updates per vendor instructions.","summary":"Microsoft .NET Framework mishandles untrusted input, allowing remote code execution. An attacker who sends a crafted document or request can take control of the affected Windows system.","severity":"critical","cvss":9.3,"epss":0.88698,"exploited":true,"exploited_at":"2021-11-03T00:00:00+00:00","products":[{"name":"Microsoft .NET Framework","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["dotnet","exploited","microsoft-office","runtime","windows"],"not_affected_if":["patched-systems"],"how_to_check":null,"fix":"Apply the Microsoft security update for .NET Framework per vendor instructions, as directed by CISA KEV.","status":"open","published_at":"2017-09-13T01:29:12+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:39:21+00:00","updated_at":"2026-10-23T21:57:34+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-10-23T21:39:21Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Microsoft security update for .NET Framework per vendor instructions, as directed by CISA KEV.","reach":"internet","impact":"high","summary":"Microsoft .NET Framework mishandles untrusted input, allowing remote code execution. An attacker who sends a crafted document or request can take control of the affected Windows system.","category":"runtime","who_cares":["windows","dotnet","microsoft-office"],"confidence":0.6,"needs_auth":"no","worst_case":"Attacker runs code on the affected Windows system remotely.","analyst_note":"Confirm affected .NET Framework versions and the exact KB patch list from Microsoft's CVE-2017-8759 advisory; the sources give no version or check details.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["patched-systems"],"user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000448,"input_tokens":2836,"output_tokens":329,"severity_before":"unknown"},"analyst_status":"queued","analyst_note":"Confirm affected .NET Framework versions and the exact KB patch list from Microsoft's CVE-2017-8759 advisory; the sources give no version or check details.","search":"'-2017':12A,15A '-8759':13A,16A 'action':81C 'affect':51B,77C 'allow':33B,69C 'appli':82C 'attack':38B,71C 'cisa':79C 'code':8A,35B,60C 'contain':57C 'control':48B,74C 'could':68C 'craft':42B 'cve':11A,14A 'document':43B 'dotnet':20B 'execut':9A,36B,61C 'exploit':21B 'framework':3A,6A,19A,29B,56C 'input':32B,66C 'instruct':86C 'microsoft':1A,4A,17A,23B,27B,54C 'microsoft-offic':22B 'mishandl':30B 'net':2A,5A,18A,28B,55C 'offic':24B 'per':84C 'process':64C 'remot':7A,34B,59C 'request':45B 'requir':80C 'runtim':25B 'send':40B 'system':53B,78C 'take':47B,73C 'untrust':31B,65C 'updat':83C 'vendor':85C 'vulner':10A,62C 'window':26B,52B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2017-09-13T01:29:12+00:00","kev":{"dateAdded":"2021-11-03","dueDate":"2022-05-03","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2017-8759","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2017-8759","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":"2026-10-25T17:39:59+00:00","note":null},{"source":"epss","external_id":"CVE-2017-8759","url":"https://api.first.org/data/v1/epss?cve=CVE-2017-8759","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-2017-8759","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-8759","severity":null,"published_at":"2017-09-13T01:29:12+00:00","modified_at":"2026-06-17T01:26:54+00:00","first_seen_at":"2026-10-23T21:57:34+00:00","fetched_at":"2026-10-23T21:57:34+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"}