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CVE-2020-0601

Improper Certificate Validation

CVSS 3.1 High 8.1Known exploited (CISA KEV)

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

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'.

Official description from the CVE record, published by microsoft. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org

Key data

CVSS 3.1 High 8.1

Score published by CISA-ADP in the CVE record.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

  • Attack vector: Network

    The vulnerable component can be reached over a network, possibly from the Internet.

  • Attack complexity: Low

    No special conditions are needed. The attack can be repeated at will.

  • Privileges required: None

    No account or privileges are needed.

  • User interaction: Required

    A user has to do something first, such as opening a file or following a link.

  • Scope: Unchanged

    The impact stays within the vulnerable component.

  • Confidentiality impact: High

    Serious or total effect on the secrecy of data.

  • Integrity impact: High

    Serious or total effect on the trustworthiness of data.

  • Availability impact: None

    No effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
Score
0.89078 (89.1% probability)
Percentile
99.8%
Scores of
Nov 10, 2026
Model
v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.
Name in the catalog
Microsoft Windows CryptoAPI Spoofing Vulnerability
Added to the catalog
Nov 3, 2021
Federal due date
May 3, 2022

CISA assessment as of Feb 7, 2025

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.
Exploitation
Recorded by CISA as active
Automatable
no
Technical impact
total

Weakness (CWE)

CWE catalog version 5.0.
CWE names: Copyright © 2006-2026, The MITRE Corporation. See /security/cve/legal for the CWE license.
  • CWE-295Improper Certificate Validation

Affected products

Products listed in the CVE record, as the CNA published them.

  • Microsoft Windows

    • affected: 10 Version 1803 for 32-bit Systems
    • affected: 10 Version 1803 for x64-based Systems
    • affected: 10 Version 1803 for ARM64-based Systems
    • affected: 10 Version 1809 for 32-bit Systems
    • affected: 10 Version 1809 for x64-based Systems
    • affected: 10 Version 1809 for ARM64-based Systems
    • affected: 10 Version 1709 for 32-bit Systems
    • affected: 10 Version 1709 for x64-based Systems
    • affected: 10 Version 1709 for ARM64-based Systems
    • affected: 10 for 32-bit Systems
    • affected: 10 for x64-based Systems
    • affected: 10 Version 1607 for 32-bit Systems
    • affected: 10 Version 1607 for x64-based Systems

  • Microsoft Windows Server

    • affected: version 1803 (Core Installation)
    • affected: 2019
    • affected: 2019 (Core installation)
    • affected: 2016
    • affected: 2016 (Core installation)

  • Microsoft Windows 10 Version 1903 for 32-bit Systems

    • affected: unspecified

  • Microsoft Windows 10 Version 1903 for x64-based Systems

    • affected: unspecified

  • Microsoft Windows 10 Version 1903 for ARM64-based Systems

    • affected: unspecified

  • Microsoft Windows Server, version 1903 (Server Core installation)

    • affected: unspecified

  • Microsoft Windows 10 Version 1909 for 32-bit Systems

    • affected: unspecified

  • Microsoft Windows 10 Version 1909 for x64-based Systems

    • affected: unspecified

  • Microsoft Windows Server, version 1909 (Server Core installation)

    • affected: unspecified

  • Microsoft Windows 10 Version 1909 for ARM64-based Systems

    • affected: unspecified

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Timeline

  1. ID reserved
  2. Record published
  3. Added to CISA KEV
  4. Record last updated

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:35 UTC. Sources and licenses