HIGH KEV
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'
Published Jan 14, 2020 ·Due May 3, 2022
8.1
HIGHCVSS 3.1
EPSS 89.44%
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
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- Version 10 Version 1607 for 32-bit SystemsStatusaffectedConstraints-
- Version 10 Version 1607 for x64-based SystemsStatusaffectedConstraints-
- Version 10 Version 1709 for 32-bit SystemsStatusaffectedConstraints-
- Version 10 Version 1709 for ARM64-based SystemsStatusaffectedConstraints-
- Version 10 Version 1709 for x64-based SystemsStatusaffectedConstraints-
- Version 10 Version 1803 for 32-bit SystemsStatusaffectedConstraints-
- Version 10 Version 1803 for ARM64-based SystemsStatusaffectedConstraints-
- Version 10 Version 1803 for x64-based SystemsStatusaffectedConstraints-
- Version 10 Version 1809 for 32-bit SystemsStatusaffectedConstraints-
- Version 10 Version 1809 for ARM64-based SystemsStatusaffectedConstraints-
- Version 10 Version 1809 for x64-based SystemsStatusaffectedConstraints-
- Version 10 for 32-bit SystemsStatusaffectedConstraints-
- Version 10 for x64-based SystemsStatusaffectedConstraints-
- Version
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- Version unspecifiedStatusaffectedConstraints-
- Version
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- Version unspecifiedStatusaffectedConstraints-
- Version
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- Version unspecifiedStatusaffectedConstraints-
- Version
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- Version unspecifiedStatusaffectedConstraints-
- Version
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- Version unspecifiedStatusaffectedConstraints-
- Version
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- Version unspecifiedStatusaffectedConstraints-
- Version
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- Version 2016StatusaffectedConstraints-
- Version 2016 (Core installation)StatusaffectedConstraints-
- Version 2019StatusaffectedConstraints-
- Version 2019 (Core installation)StatusaffectedConstraints-
- Version version 1803 (Core Installation)StatusaffectedConstraints-
- Version
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- Version unspecifiedStatusaffectedConstraints-
- Version
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- Version unspecifiedStatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Windows | n/a |
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| Microsoft | Windows 10 Version 1903 for 32-bit Systems | n/a |
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| Microsoft | Windows 10 Version 1903 for ARM64-based Systems | n/a |
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| Microsoft | Windows 10 Version 1903 for x64-based Systems | n/a |
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| Microsoft | Windows 10 Version 1909 for 32-bit Systems | n/a |
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| Microsoft | Windows 10 Version 1909 for ARM64-based Systems | n/a |
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| Microsoft | Windows 10 Version 1909 for x64-based Systems | n/a |
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| Microsoft | Windows Server | n/a |
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| Microsoft | Windows Server, version 1903 (Server Core installation) | n/a |
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| Microsoft | Windows Server, version 1909 (Server Core installation) | n/a |
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Configuration 1
OR
- n/a
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No data.
No Red Hat product state for this CVE.
stdlib
Go
Introduced 0 Fixed 1.12.16stdlib
Go
Introduced 1.13.0-0 Fixed 1.13.7
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Go | stdlib | 0 | 1.12.16 |
| Go | stdlib | 1.13.0-0 | 1.13.7 |
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
8.1 HIGH NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact None
No CVSS v3.0 score for this CVE.
5.8 MEDIUM NVD
AV:N/AC:M/Au:N/C:P/I:P/A:N
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact None
Listed in CISA KEV KEV
Date Added
Nov 3, 2021
Patch Due
May 3, 2022
Required Action
Apply updates per vendor instructions.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
ActiveAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Feb 7, 2025 · SSVC 2.0.3
89.44% 0.89436
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
EPSS probability 0.89436
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (32 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 89.44% (0.89436) | 99.78th | v5 (v2026.06.15) |
| Jun 15, 2026 | 89.44% (0.89436) | 99.77th | v5 (v2026.06.15) |
| Nov 21, 2025 | 94.09% (0.94093) | 99.90th | v4 (v2025.03.14) |
| Nov 18, 2025 | 92.52% (0.92515) | 99.80th | v4 (v2025.03.14) |
| Mar 17, 2025 | 93.91% (0.93911) | 99.87th | v4 (v2025.03.14) |
| Dec 12, 2024 | 96.91% (0.96910) | 99.77th | v3 (v2023.03.01) |
| Jul 12, 2024 | 96.84% (0.96836) | 99.72th | v3 (v2023.03.01) |
| May 27, 2024 | 96.89% (0.96890) | 99.71th | v3 (v2023.03.01) |
| Apr 10, 2024 | 97.03% (0.97026) | 99.74th | v3 (v2023.03.01) |
| Mar 10, 2024 | 96.93% (0.96929) | 99.70th | v3 (v2023.03.01) |
| Feb 23, 2024 | 96.84% (0.96838) | 99.66th | v3 (v2023.03.01) |
| Jan 7, 2024 | 96.69% (0.96685) | 99.56th | v3 (v2023.03.01) |
| Nov 18, 2023 | 96.80% (0.96795) | 99.59th | v3 (v2023.03.01) |
| Nov 3, 2023 | 96.70% (0.96696) | 99.53th | v3 (v2023.03.01) |
| Oct 1, 2023 | 96.64% (0.96642) | 99.50th | v3 (v2023.03.01) |
| Sep 13, 2023 | 96.66% (0.96656) | 99.49th | v3 (v2023.03.01) |
| Aug 28, 2023 | 96.73% (0.96729) | 99.50th | v3 (v2023.03.01) |
| Aug 11, 2023 | 96.66% (0.96657) | 99.47th | v3 (v2023.03.01) |
| Jul 24, 2023 | 96.84% (0.96839) | 99.53th | v3 (v2023.03.01) |
| Jul 8, 2023 | 97.14% (0.97143) | 99.67th | v3 (v2023.03.01) |
| Jul 6, 2023 | 97.21% (0.97208) | 99.71th | v3 (v2023.03.01) |
| Jun 3, 2023 | 97.19% (0.97190) | 99.69th | v3 (v2023.03.01) |
| May 19, 2023 | 97.18% (0.97182) | 99.68th | v3 (v2023.03.01) |
| May 8, 2023 | 97.21% (0.97215) | 99.70th | v3 (v2023.03.01) |
| May 2, 2023 | 97.28% (0.97284) | 99.75th | v3 (v2023.03.01) |
| Mar 17, 2023 | 97.33% (0.97331) | 99.77th | v3 (v2023.03.01) |
| Mar 7, 2023 | 97.31% (0.97309) | 99.74th | v3 (v2023.03.01) |
| Mar 6, 2023 | 38.32% (0.38320) | 97.97th | v2 (v2022.01.01) |
| Feb 4, 2022 | 38.32% (0.38320) | 97.25th | v2 (v2022.01.01) |
| Feb 3, 2022 | 30.10% (0.30098) | 96.74th | v1 |
| Sep 1, 2021 | 30.10% (0.30098) | 98.51th | v1 |
| Apr 14, 2021 | 30.10% (0.30098) | 0.00th | v1 |
Weaknesses (1)
References (4)
- http://packetstormsecurity.com/files/155960/CurveBall-Microsoft-Windows-CryptoAPI-Spoofing-Proof-Of-Concept.html x_refsource_MISCThird Party AdvisoryVDB Entry
- http://packetstormsecurity.com/files/155961/CurveBall-Microsoft-Windows-CryptoAPI-Spoofing-Proof-Of-Concept.html x_refsource_MISCThird Party AdvisoryVDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0601 x_refsource_MISCPatchVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0601 government-resourceUS Government Resource
| Link | Providers | Tags |
|---|---|---|
| http://packetstormsecurity.com/files/155960/CurveBall-Microsoft-Windows-CryptoAPI-Spoofing-Proof-Of-Concept.html | x_refsource_MISCThird Party AdvisoryVDB Entry | |
| http://packetstormsecurity.com/files/155961/CurveBall-Microsoft-Windows-CryptoAPI-Spoofing-Proof-Of-Concept.html | x_refsource_MISCThird Party AdvisoryVDB Entry | |
| https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0601 | x_refsource_MISCPatchVendor Advisory | |
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0601 | government-resourceUS Government Resource |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner microsoft
Published Jan 14, 2020
Updated Oct 21, 2025
Reserved Nov 4, 2019
Link CVE-2020-0601
CISA Vulnrichment
Updated Feb 7, 2025