{"id":"CVE-2017-8759","published":"2017-09-13T01:29:12Z","modified":"2026-06-17T01:26:54Z","title":"Microsoft .NET Framework Remote Code Execution Vulnerability","vendor":"Microsoft","product":".NET Framework","tier":"core","eol":null,"description":{"text":"Microsoft .NET Framework 2.0, 3.5, 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2 and 4.7 allow an attacker to execute code remotely via a malicious document or application, aka \".NET Framework Remote Code Execution Vulnerability.\"","provenance":"source","from":"NVD"},"summary":{"text":"The Microsoft .NET Framework (versions 2.0 through 4.7, including 3.5, 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2 and 4.7) contains a flaw in how it handles code generation and input validation that allows code execution. An attacker can run arbitrary code on the affected system by getting a user to open a malicious document or application, requiring local access and user interaction but no prior authentication.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T08:31:13Z"},"cvss":{"score":7.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.88698,"percentile":0.99774,"date":"2026-10-28","provenance":"source"},"kev":{"dateAdded":"2021-11-03","dueDate":"2022-05-03","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://nvd.nist.gov/vuln/detail/CVE-2017-8759","provenance":"source"},"vulncheckKev":{"dateAdded":"2017-09-12","exploitedFirstSeen":"2017-09-12","ransomware":false,"evidence":[{"url":"https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2017-Sep","date":"2017-09-12"},{"url":"https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit","date":"2017-09-12"},{"url":"https://www.fireeye.com/blog/threat-research/2017/09/zero-day-used-to-distribute-finspy.html","date":"2017-09-12"},{"url":"https://securelist.com/blackoasis-apt-and-new-targeted-attacks-leveraging-zero-day-exploit/82732/","date":"2017-10-16"},{"url":"https://www.proofpoint.com/us/threat-insight/post/leviathan-espionage-actor-spearphishes-maritime-and-defense-targets","date":"2017-10-16"},{"url":"https://www.trendmicro.com/en_us/research/17/k/cobalt-spam-runs-use-macros-cve-2017-8759-exploit.html","date":"2017-11-20"},{"url":"https://blog.trendmicro.co.jp/archives/17280","date":"2018-04-17"},{"url":"https://www.trendmicro.com/en_us/research/18/c/chessmaster-adds-updated-tools-to-its-arsenal.html","date":"2018-04-17"},{"url":"https://www.fireeye.com/blog/threat-research/2019/03/apt40-examining-a-china-nexus-espionage-actor.html","date":"2019-03-04"},{"url":"https://blog.talosintelligence.com/2019/07/sweed-agent-tesla.html","date":"2019-07-15"}],"evidenceTotal":17,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-94","name":"Improper Control of Generation of Code"},{"id":"CWE-20","name":"Improper Input Validation"}],"references":[{"url":"http://www.securityfocus.com/bid/100742","tags":["Broken Link","Third Party Advisory","VDB Entry"]},{"url":"http://www.securitytracker.com/id/1039324","tags":["Broken Link","Third Party Advisory","VDB Entry"]},{"url":"https://github.com/GitHubAssessments/CVE_Assessments_01_2020","tags":["Third Party Advisory"]},{"url":"https://github.com/bhdresh/CVE-2017-8759","tags":["Exploit","Third Party Advisory"]},{"url":"https://github.com/nccgroup/CVE-2017-8759","tags":["Exploit","Third Party Advisory"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8759","tags":["Patch","Vendor Advisory"]},{"url":"https://www.exploit-db.com/exploits/42711/","tags":["Third Party Advisory","VDB Entry"]},{"url":"http://www.securityfocus.com/bid/100742","tags":["Broken Link","Third Party Advisory","VDB Entry"]},{"url":"http://www.securitytracker.com/id/1039324","tags":["Broken Link","Third Party Advisory","VDB Entry"]},{"url":"https://github.com/GitHubAssessments/CVE_Assessments_01_2020","tags":["Third Party Advisory"]},{"url":"https://github.com/bhdresh/CVE-2017-8759","tags":["Exploit","Third Party Advisory"]},{"url":"https://github.com/nccgroup/CVE-2017-8759","tags":["Exploit","Third Party Advisory"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8759","tags":["Patch","Vendor Advisory"]},{"url":"https://www.exploit-db.com/exploits/42711/","tags":["Third Party Advisory","VDB Entry"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-8759","tags":["US Government Resource"]}],"techniques":[{"id":"T1203","name":"Exploitation for Client Execution","tactics":["execution"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve","dataset-annotation"],"basisDetail":"CTID attack_to_cve (Phase 1); AnnoCTR expert entity-linking label (train split)","mappingType":"uncategorized","evidence":[{"reportId":"SRC-ceefdd3b373149b188b8","quote":"o    CVE-2012-0158 [2]\r\no    CVE-2017-0199 [3]\r\no    CVE-2017-8759 [5]","start":6457,"end":6527},{"reportId":"SRC-ceefdd3b373149b188b8","quote":"o    CVE-2017-0199 [3]\r\no    CVE-2017-8759 [5]","start":6481,"end":6527},{"reportId":"SRC-ceefdd3b373149b188b8","quote":"o    CVE-2017-8759 [5]","start":6505,"end":6527}],"confidence":"low","confidenceNote":"CTID attack_to_cve Phase 1 \"Uncategorized\" mapping (not staged by impact)"},{"id":"T1566","name":"Phishing","tactics":["initial-access"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve"],"basisDetail":"CTID attack_to_cve (Phase 1)","mappingType":"uncategorized","evidence":[],"confidence":"low","confidenceNote":"CTID attack_to_cve Phase 1 \"Uncategorized\" mapping (not staged by impact)"},{"id":"T1204.002","name":"Malicious File","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: user opens malicious document or application","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"execute code remotely via a malicious document or application","start":96,"end":157}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1059","name":"Command and Scripting Interpreter","tactics":["execution"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: direct remote code execution impact","mappingType":"primary_impact","evidence":[{"from":"description","quote":"allow an attacker to execute code remotely","start":75,"end":117}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[{"id":"SRC-ceefdd3b373149b188b8","title":"Leviathan: Geostrategy and TTP (Tactics, Techniques and Procedures)","publisher":"Lab52 / S2 Grupo","url":"https://github.com/boschresearch/anno-ctr-lrec-coling-2024/blob/d510b6949e1938d47c93a43eedd562dc538439dc/AnnoCTR/text/train/lab52_2019-05-30_leviathan-geostrategy-and-ttp-technical.txt","date":"2019-05-30","mentions":[{"quote":"o    CVE-2017-8759 [5]","start":6505,"end":6527},{"quote":"<https://www.fireeye.com/blog/threat-research/2019/03/apt40-examining-a-china-nexus-espionage-actor.html>\r\n[2] <http://cve.circl.lu/cve/CVE-2012-0158>\r\n[3] http://cve.circl.lu/cve/CVE-2017-0199\r\n[4] <https://attack.mitre.org/matrices/enterprise/>\r\n[5] <http://cve.circl.lu/cve/CVE-2017-8759>","start":13523,"end":13814}]},{"id":"SRC-1efa6a74fdce18acbc7a","title":"Cobalt Strikes Again, Spam Runs Target Russian Banks","publisher":"trendmicro.com","url":"https://www.trendmicro.com/en_us/research/17/k/cobalt-spam-runs-use-macros-cve-2017-8759-exploit.html","date":"2017-11-20","mentions":[{"quote":"Apart from using a different vulnerability (CVE-2017-8759), what’s unique in their latest spear phishing campaigns, compared to their previous spam runs and even other related cybercriminal campaigns, is an apparent role change.","start":1588,"end":1816},{"quote":"The second, which ran from September 20 to 21, used an exploit for CVE-2017-8759 (patched last September), a code injection/remote code execution vulnerability in Microsoft’s .NET Framework.","start":2393,"end":2583},{"quote":"server, which is actually a backdoor\nSome of the backdoor’s commands are:\n- d&exec — download and execute PE file\n- more_eggs — download additional scripts\n- gtfo — delete files/startup entries and terminate\n- more_onion — run additional script\n- more_power — run command shell commands\nInfection Chain via CVE-2017-8759","start":4972,"end":5292},{"quote":"Infection chain using CVE-2017-8759","start":5710,"end":5745},{"quote":"Spam emails whose attachments contain an exploit for CVE-2017-8759","start":5756,"end":5822}]},{"id":"SRC-8ac40113865dd38a2bc6","title":"Leviathan: Espionage Actor Targets Defense & Government","publisher":"proofpoint.com","url":"https://www.proofpoint.com/us/threat-insight/post/leviathan-espionage-actor-spearphishes-maritime-and-defense-targets","date":"2017-10-16","mentions":[{"quote":"Exploitation: Microsoft Excel and Word documents with macros (sometimes password-protected), very recent vulnerabilities such as CVE-2017-0199 and CVE-2017-8759, and malicious Microsoft Publisher files","start":1061,"end":1262},{"quote":"The attachments exploited CVE-2017-8759 which was discovered and documented only five days prior to the campaign [1].","start":2451,"end":2568},{"quote":"Resume.rtf exploiting CVE-2017-8759 (Sep 19, 2017)","start":14752,"end":14802},{"quote":"ARLUAS_FieldLog_2017-08-21.doc exploiting CVE-2017-8759 (Sep 19, 2017)","start":14884,"end":14954}]},{"id":"SRC-7337a86c8549e6b0b5ea","title":"2020 Financial Services and Insurance Industry Threat Report","publisher":"proofpoint.com","url":"https://www.proofpoint.com/sites/default/files/threat-reports/pfpt-au-tr-financial-services-and-insurance.pdf","date":null,"mentions":[{"quote":"CVE-2017-11882 JavaJavaScript\r\nCAPTCHA CVE-2018-8174\r\nCompiled HTML File\r\nAutolt HTA Packager Shell Object IP Filtering Certutil CVE-2017-8570 Application Access Token Shortcut\r\nFallout Exploit Kit CVE-2018-0802 Headers fencing XL4 macros\r\nCVE-2017-0199 CVE-2017-8759Lotus-Blue Toolkit (O365) Template Injection","start":24386,"end":24697},{"quote":"t\r\nBlackTDS\r\nLCG Kit\r\nCVE-2014-0515\r\nCVE-2017-11882\r\nJava\r\nPassword Protected\r\nCAPTCHA\r\nCVE-2018-8174\r\nCompiled HTML File\r\nAutolt HTAPackager Shell Object IP FilteringCertutil CVE-2017-8570\r\nApplication Access Token\r\nShortcut\r\nFallout Exploit Kit\r\nCVE-2018-0802\r\nHeaders fencing\r\nXL4 macros\r\nCVE-2017-0199\r\nCVE-2017-8759","start":27592,"end":27912},{"quote":"BlackTDS\r\nLCG Kit\r\nCVE-2014-0515\r\nCVE-2017-11882\r\nJava\r\nPassword Protected\r\nCAPTCHA\r\nCVE-2018-8174\r\nCompiled HTML File\r\nAutolt\r\nHTA\r\nPackager Shell Object\r\nIP FilteringCertutil CVE-2017-8570Application Access Token\r\nShortcut\r\nFallout Exploit Kit\r\nCVE-2018-0802\r\nHeaders fencing\r\nXL4 macros\r\nCVE-2017-0199\r\nCVE-2017-8759","start":33681,"end":34000}]}],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2017-17705","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2017-17705","exploited":true,"exploitedSince":"2021-11-03","provenance":"source"},"exploits":[{"id":42711,"url":"https://www.exploit-db.com/exploits/42711","title":"Microsoft Windows .NET Framework - Remote Code Execution","type":"remote","platform":"windows","date":"2017-09-13","verified":false,"provenance":"source"}],"exploitSources":{"exploitdb":{"count":1,"earliest":"2017-09-13"},"pocGithub":{"count":15,"skipped":1,"earliest":"2017-09-13","earliestUrl":"https://github.com/Voulnet/CVE-2017-8759-Exploit-sample","repos":[{"name":"bhdresh/CVE-2017-8759","url":"https://github.com/bhdresh/CVE-2017-8759","stars":312,"created":"2017-09-14"},{"name":"Voulnet/CVE-2017-8759-Exploit-sample","url":"https://github.com/Voulnet/CVE-2017-8759-Exploit-sample","stars":256,"created":"2017-09-13"},{"name":"vysecurity/CVE-2017-8759","url":"https://github.com/vysecurity/CVE-2017-8759","stars":176,"created":"2017-09-13"},{"name":"nccgroup/CVE-2017-8759","url":"https://github.com/nccgroup/CVE-2017-8759","stars":94,"created":"2017-09-13"},{"name":"JonasUliana/CVE-2017-8759","url":"https://github.com/JonasUliana/CVE-2017-8759","stars":5,"created":"2017-09-17"}]},"first":{"date":"2017-09-13","source":"Exploit-DB","url":"https://www.exploit-db.com/exploits/42711"},"provenance":"source"},"detections":{"cveRules":[{"title":"Exploit for CVE-2017-8759","id":"fdd84c68-a1f6-47c9-9477-920584f94905","level":"critical","status":"test","path":"rules-emerging-threats/2017/Exploits/CVE-2017-8759/proc_creation_win_exploit_cve_2017_8759.yml","url":"https://github.com/SigmaHQ/sigma/blob/master/rules-emerging-threats/2017/Exploits/CVE-2017-8759/proc_creation_win_exploit_cve_2017_8759.yml","techniques":["T1203","T1204.002","T1566.001"]}]},"exploitRefs":["https://github.com/bhdresh/CVE-2017-8759","https://github.com/nccgroup/CVE-2017-8759","https://www.exploit-db.com/exploits/42711/"],"flow":[{"stage":"exploitation","techniques":["T1204.002"],"provenance":"ai"},{"stage":"primary","techniques":["T1059"],"provenance":"ai"},{"stage":"related","techniques":["T1566","T1203"],"provenance":"source","lowConfidence":true}],"timeline":[{"date":"2017-09-12","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2017-Sep","provenance":"source"},{"date":"2017-09-13","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-8759","provenance":"source"},{"date":"2017-09-13","kind":"exploit-public","label":"First public exploit: Exploit-DB (EDB-42711); later: PoC-in-GitHub 2017-09-13","url":"https://www.exploit-db.com/exploits/42711","provenance":"source"},{"date":"2017-10-16","kind":"report","label":"Named in proofpoint.com: Leviathan: Espionage Actor Targets Defense & Government","url":"https://www.proofpoint.com/us/threat-insight/post/leviathan-espionage-actor-spearphishes-maritime-and-defense-targets","provenance":"machine"},{"date":"2017-11-20","kind":"report","label":"Named in trendmicro.com: Cobalt Strikes Again, Spam Runs Target Russian 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in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 3334 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.95,"detail":"percentile 0.9977"},{"name":"Named in threat reports","points":8.98,"detail":"4 reports"},{"name":"Public exploit code","points":5.0,"detail":"2 NVD references tagged Exploit; 1 Exploit-DB entry; 1 NVD exploit link; 15 PoC-in-GitHub repos"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":5.46,"detail":"base score 7.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"familyId":"fam-class-microsoft-net-cwe-20"}}