# CVE-2020-0601: Microsoft Windows CryptoAPI Spoofing Vulnerability

> CVE-2020-0601: Microsoft Windows CryptoAPI Spoofing Vulnerability. CVSS 8.1 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2020-0601
Last updated: 2025-10-21T23:35:53Z

- Published: 2020-01-14 23:11 UTC · Updated: 2025-10-21 23:35 UTC · Assigner: microsoft
- CVSS: 8.1 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
- EPSS: 89.1%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2021-11-03, federal due date 2022-05-03, ransomware use: Unknown

## 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'.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Microsoft: Windows
- Microsoft: Windows 10 Version 1903 for 32-bit Systems
- Microsoft: Windows 10 Version 1903 for ARM64-based Systems
- Microsoft: Windows 10 Version 1903 for x64-based Systems
- Microsoft: Windows 10 Version 1909 for 32-bit Systems
- Microsoft: Windows 10 Version 1909 for ARM64-based Systems
- Microsoft: Windows 10 Version 1909 for x64-based Systems
- Microsoft: Windows Server
- Microsoft: Windows Server, version 1903 (Server Core installation)
- Microsoft: Windows Server, version 1909 (Server Core installation)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2020-0601)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2020-0601)
- [http://packetstormsecurity.com/files/155960/CurveBall-Microsoft-Windows-CryptoAPI-Spoofing-Proof-Of-Concept.html](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](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://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0601)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2020-0601 · Markdown: https://rewindex.com/cve/CVE-2020-0601.md · JSON: https://rewindex.com/api/v1/cves/CVE-2020-0601 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:05:18.649Z