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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'.","epss":{"date":"2026-11-12","epss":0.89078,"percentile":0.99783},"epss_checked":1794522003,"first_seen":1793665375,"kev":{"cveID":"CVE-2020-0601","cwes":["CWE-295"],"dateAdded":"2021-11-03","dueDate":"2022-05-03","forensicTriage":"No","knownRansomwareCampaignUse":"Unknown","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","product":"Windows","requiredAction":"Apply updates per vendor instructions.","shortDescription":"Microsoft Windows CryptoAPI (Crypt32.dll) contains a spoofing vulnerability in the way it 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. A successful exploit could also allow the attacker to conduct man-in-the-middle attacks and decrypt confidential information on user connections to the affected software. The vulnerability is also known under the moniker of CurveBall.","vendorProject":"Microsoft","vulnerabilityName":"Microsoft Windows CryptoAPI Spoofing Vulnerability"},"kev_checked":1794522003,"products":"Microsoft Windows, Microsoft Windows Server, Microsoft Windows 10 Version 1903 for 32-bit Systems, Microsoft Windows 10 Version 1903 for x64-based Systems, Microsoft Windows 10 Version 1903 for ARM64-based Systems, Microsoft Windows Server, version 1903 (Server Core installation), Microsoft Windows 10 Version 1909 for 32-bit Systems, Microsoft Windows 10 Version 1909 for x64-based Systems, Microsoft Windows Server, version 1909 (Server Core installation), Microsoft Windows 10 Version 1909 for ARM64-based Systems","references":["https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0601","http://packetstormsecurity.com/files/155961/CurveBall-Microsoft-Windows-CryptoAPI-Spoofing-Proof-Of-Concept.html","http://packetstormsecurity.com/files/155960/CurveBall-Microsoft-Windows-CryptoAPI-Spoofing-Proof-Of-Concept.html","https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0601"],"score":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","provider":"CISA-ADP","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","version":"3.1"},"solutions":"","state":"PUBLISHED","title":"Microsoft Windows CryptoAPI Spoofing Vulnerability","updated_at":1794500401,"workarounds":""},"sources":[]}