{"id":"CVE-2020-0601","published":"2020-01-14T23:15:30Z","modified":"2026-06-17T02:46:08Z","title":"Microsoft Windows CryptoAPI Spoofing Vulnerability","vendor":"Microsoft","product":"Windows","tier":"core","eol":null,"description":{"text":"A spoofing vulnerability exists in the way Windows CryptoAPI (Crypt32.dll) validates Elliptic Curve Cryptography (ECC) certificates.An attacker could exploit the vulnerability by using a spoofed code-signing certificate to sign a malicious executable, making it appear the file was from a trusted, legitimate source, aka 'Windows CryptoAPI Spoofing Vulnerability'.","provenance":"source","from":"NVD"},"summary":{"text":"A spoofing flaw in Microsoft Windows lies in how the Windows CryptoAPI component (Crypt32.dll) validates Elliptic Curve Cryptography certificates. An attacker can exploit it over the network without authentication, but needs a user to interact with the malicious content, by using a spoofed code-signing certificate to sign a malicious executable so it appears to come from a trusted source.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:10:39Z"},"cvss":{"score":8.1,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","provenance":"source","from":"NVD"},"epss":{"score":0.89078,"percentile":0.99779,"date":"2026-10-28","provenance":"source"},"kev":{"dateAdded":"2021-11-03","dueDate":"2022-05-03","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"Reference CISA's ED 20-02 (https://www.cisa.gov/news-events/directives/ed-20-02-mitigate-windows-vulnerabilities-january-2020-patch-tuesday) for further guidance and requirements. Note: The due date for addressing this vulnerability aligns with the requirements outlined in ED 20-02. https://nvd.nist.gov/vuln/detail/CVE-2020-0601","provenance":"source"},"vulncheckKev":{"dateAdded":"2020-01-14","exploitedFirstSeen":"2020-01-14","ransomware":true,"evidence":[{"url":"https://cisa.gov/news-events/cybersecurity-advisories/aa20-014a","date":"2020-01-14"},{"url":"https://www.niiconsulting.com/Security_Advisories/Security_Advisory_Digest_Feb_2020_Edition_1.pdf","date":"2020-01-22"},{"url":"https://go.recordedfuture.com/hubfs/reports/cta-2020-0603.pdf","date":"2020-06-03"},{"url":"https://cisa.gov/news-events/cybersecurity-advisories/aa20-275a","date":"2020-10-20"},{"url":"https://media.defense.gov/2020/Oct/20/2002519884/-1/-1/0/CSA_CHINESE_EXPLOIT_VULNERABILITIES_UOO179811.PDF","date":"2020-10-20"},{"url":"https://us-cert.cisa.gov/ncas/alerts/aa20-275a","date":"2020-10-20"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2021-11-03"},{"url":"https://cybersecurityworks.com/howdymanage/uploads/file/Spotlight%20Report%20-%20Index%20Update%20Q2%20-%20Q3%20-%20Final%20Version_compressed.pdf","date":"2022-05-18"},{"url":"https://www.ivanti.com/resources/v/doc/pr-survey-report/ransomware-quarterly-indexreport_q2-q3","date":"2022-10-21"},{"url":"https://info.securin.io/hubfs/Securin%20Ransomware%20Report%202023.pdf","date":"2023-02-14"}],"evidenceTotal":12,"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":"Nowords.","url":"https://otx.alienvault.com/pulse/6ad39f36b89719f9eb60f513","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-295","name":"Improper Certificate Validation"}],"references":[{"url":"http://packetstormsecurity.com/files/155960/CurveBall-Microsoft-Windows-CryptoAPI-Spoofing-Proof-Of-Concept.html","tags":["Third Party Advisory","VDB Entry"]},{"url":"http://packetstormsecurity.com/files/155961/CurveBall-Microsoft-Windows-CryptoAPI-Spoofing-Proof-Of-Concept.html","tags":["Third Party Advisory","VDB Entry"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0601","tags":["Patch","Vendor Advisory"]},{"url":"http://packetstormsecurity.com/files/155960/CurveBall-Microsoft-Windows-CryptoAPI-Spoofing-Proof-Of-Concept.html","tags":["Third Party Advisory","VDB Entry"]},{"url":"http://packetstormsecurity.com/files/155961/CurveBall-Microsoft-Windows-CryptoAPI-Spoofing-Proof-Of-Concept.html","tags":["Third Party Advisory","VDB Entry"]},{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0601","tags":["Patch","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0601","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"source","basis":"ctid-cve","bases":["ctid-cve"],"basisDetail":"CTID attack_to_cve (Phase 1)","mappingType":"uncategorized","evidence":[],"confidence":"low","confidenceNote":"needs user interaction; not a public-facing exploit"},{"id":"T1203","name":"Exploitation for Client Execution","tactics":["execution"],"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":"T1553.002","name":"Code Signing","tactics":["defense-impairment"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Forged certificate signs malicious executable; subverts code-signing trust","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"using a spoofed code-signing certificate to sign a malicious executable","start":179,"end":250}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1036","name":"Masquerading","tactics":["stealth"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Spoofed signature makes malware appear legitimate","mappingType":"primary_impact","evidence":[{"from":"description","quote":"making it appear the file was from a trusted, legitimate source","start":252,"end":315}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[{"ecosystem":"Go","package":"stdlib","vulnerableRanges":["<1.12.16",">=1.13.0-0, <1.13.7"],"patched":["1.12.16","1.13.7"],"from":["GO-2022-0535"],"provenance":"source"}],"advisories":[{"id":"GO-2022-0535","url":"https://osv.dev/vulnerability/GO-2022-0535","severity":null,"ecosystem":"Go","package":"stdlib","vulnerableRanges":["<1.12.16",">=1.13.0-0, <1.13.7"],"patched":["1.12.16","1.13.7"],"provenance":"source","from":"OSV"}],"euvd":{"id":"EUVD-2020-2099","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-2099","exploited":true,"exploitedSince":"2021-11-03","provenance":"source"},"exploits":[{"id":47933,"url":"https://www.exploit-db.com/exploits/47933","title":"Microsoft Windows - CryptoAPI (Crypt32.dll) Elliptic Curve Cryptography (ECC) Spoof Code-Signing Certificate","type":"local","platform":"windows","date":"2020-01-15","verified":false,"provenance":"source"}],"exploitSources":{"exploitdb":{"count":1,"earliest":"2020-01-15"},"pocGithub":{"count":30,"skipped":5,"earliest":"2020-01-14","earliestUrl":"https://github.com/nissan-sudo/CVE-2020-0601","repos":[{"name":"ly4k/CurveBall","url":"https://github.com/ly4k/CurveBall","stars":890,"created":"2020-01-15"},{"name":"kudelskisecurity/chainoffools","url":"https://github.com/kudelskisecurity/chainoffools","stars":336,"created":"2020-01-15"},{"name":"gentilkiwi/curveball","url":"https://github.com/gentilkiwi/curveball","stars":78,"created":"2020-01-20"},{"name":"saleemrashid/badecparams","url":"https://github.com/saleemrashid/badecparams","stars":66,"created":"2020-01-16"},{"name":"0xxon/cve-2020-0601","url":"https://github.com/0xxon/cve-2020-0601","stars":35,"created":"2020-01-15"}]},"first":{"date":"2020-01-14","source":"PoC-in-GitHub","url":"https://github.com/nissan-sudo/CVE-2020-0601"},"provenance":"source"},"exploitRefs":["http://packetstormsecurity.com/files/155960/CurveBall-Microsoft-Windows-CryptoAPI-Spoofing-Proof-Of-Concept.html","http://packetstormsecurity.com/files/155961/CurveBall-Microsoft-Windows-CryptoAPI-Spoofing-Proof-Of-Concept.html"],"flow":[{"stage":"exploitation","techniques":["T1553.002"],"provenance":"ai"},{"stage":"primary","techniques":["T1036"],"provenance":"ai"},{"stage":"related","techniques":["T1190","T1203"],"provenance":"source","lowConfidence":true}],"timeline":[{"date":"2020-01-14","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-0601","provenance":"source"},{"date":"2020-01-14","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub; 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2 NVD exploit links; 30 PoC-in-GitHub repos"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":5.67,"detail":"base score 8.1"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"packageHistory":[{"cve":"CVE-2019-9514","published":"2019-08-13","fixed":"1.12.8","kev":false},{"cve":"CVE-2019-16276","published":"2019-09-30","fixed":"1.13.1","kev":false},{"cve":"CVE-2019-17596","published":"2019-10-24","fixed":"1.13.2","kev":false,"link":{"from":"CVE-2019-17596","to":"CVE-2020-0601","relation":"successor","confidence":"low","kind":"sequence","evidence":[{"kind":"version-step","provenance":"source","package":"Go:stdlib","fromFixed":"1.12.11","toFixed":"1.12.16","daysApart":82}]}},{"cve":"CVE-2020-0601","published":"2020-01-14","fixed":"1.13.7","kev":true},{"cve":"CVE-2020-7919","published":"2020-03-16","fixed":"1.13.7","kev":false},{"cve":"CVE-2020-14039","published":"2020-07-17","fixed":"1.14.5","kev":false},{"cve":"CVE-2020-15586","published":"2020-07-17","fixed":"1.14.5","kev":false}],"package":"Go:stdlib"}}