CVEvulnerability

CVE-2020-0601

8.1 HIGH Known exploited Published 2020-01-14 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

Microsoft Windows CryptoAPI Spoofing Vulnerability — Microsoft Windows

Microsoft Windows CryptoAPI (Crypt32.dll) contains a spoofing vulnerability in the way it 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. A successful exploit could also allow the attacker to conduct man-in-the-middle attacks and decrypt confidential information on user connections to the affected software. The vulnerability is also known under the moniker of CurveBall.

Added to KEV
2021-11-03
Remediation due
2022-05-03
Ransomware use
Unknown
Required action
Apply updates per vendor instructions.
Notes
Reference CISA's ED 20-02 (https://www.cisa.gov/news-events/directives/ed-20-02-mitigate-windows-vulnerabilities-january-2020-patch-tuesday) for further guidance and requirements. Note: The due date for addressing this vulnerability aligns with the requirements outlined in ED 20-02. https://nvd.nist.gov/vuln/detail/CVE-2020-0601
Status
Analyzed
Published
2020-01-14
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
8.1 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
8.1 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS 2.0 ([email protected])
5.8 MEDIUM — AV:N/AC:M/Au:N/C:P/I:P/A:N
Weaknesses
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 configurations

• microsoft windows 10 1507 • microsoft windows 10 1607 • microsoft windows 10 1709 • microsoft windows 10 1803 • microsoft windows 10 1809 • microsoft windows 10 1903 • microsoft windows 10 1909 • microsoft windows server 1803 • microsoft windows server 1903 • microsoft windows server 1909 • microsoft windows server 2016 • microsoft windows server 2019 • golang go (>= 1.12 < 1.12.16) • golang go (>= 1.13 < 1.13.7)

Related

Weakness · CWE (1)

  • CWE-295 Improper Certificate Validation weakness

References