What’s Vulnerable › Vulnerabilities

CVE-2020-0601: Microsoft Windows CryptoAPI Spoofing Vulnerability

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 89.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-01-14 · updated 2026-06-17
• Weakness: CWE-295

Description

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'.

Affected products

• Go: from 1.12 before 1.12.16; from 1.13 before 1.13.7 — fixed in 1.12.16, 1.13.7
• Microsoft Windows 10 Version 1507: all versions
• Microsoft Windows 10 1607: all versions
• Microsoft Windows 10 1709: all versions
• Microsoft Windows 10 1803: all versions
• Microsoft Windows 10: all versions
• Microsoft Windows 10 1903: all versions
• Microsoft Windows 10 1909: all versions
• Microsoft Windows Server 1803: all versions
• Microsoft Windows Server 1903: all versions
• Microsoft Windows Server 1909: all versions
• Microsoft Windows Server 2016: all versions
• Microsoft Windows Server 2019: all versions
• Microsoft Corporation Windows: 10 Version 1803 for 32-bit Systems, 10 Version 1803 for x64-based Systems, 10 Version 1803 for ARM64-based Systems, 10 Version 1809 for 32-bit Systems, 10 Version 1809 for x64-based Systems, 10 Version 1809 for ARM64-based Systems (+7)
• Microsoft Windows 10 Version 1903 for 32-bit Systems: all versions
• Microsoft Windows 10 Version 1903 for ARM64-based Systems: all versions
• Microsoft Windows 10 Version 1903 for x64-based Systems: all versions
• Microsoft Windows 10 Version 1909 for 32-bit Systems: all versions
• Microsoft Windows 10 Version 1909 for ARM64-based Systems: all versions
• Microsoft Windows 10 Version 1909 for x64-based Systems: all versions
• Microsoft Windows Server: version 1803 (Core Installation), 2019, 2019 (Core installation), 2016, 2016 (Core installation)
• Microsoft Windows Server, version 1903 (Server Core installation): all versions
• Microsoft Windows Server, version 1909 (Server Core installation): all versions

How to fix

Upgrade to a fixed version: Go 1.12.16, 1.13.7. Check the vendor advisory for mitigations.

References

• 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
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0601
• 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
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0601
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0601

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