Which products and versions are affected by CVE-2020-0601?

Affected: Go (Golang); Windows (Microsoft) versions >= 10 Version 1803 for 32-bit Systems; Windows 10 1507 (Microsoft), among others. The full list is in the CVE brief.

Is CVE-2020-0601 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 14, 2020 and is known to be used in ransomware campaigns.

Is CVE-2020-0601 in the CISA KEV catalog?

Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.

Is there a public exploit for CVE-2020-0601?

Public exploit code is available.

Is there a fix for CVE-2020-0601?

Fixed versions are available, including containerd 1.3.3-r0, golang 1.12.16, golang 1.13.7.

How urgently should CVE-2020-0601 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2020-0601

HighExploitedPublic exploit

Certificate validation bypass on Windows in crypto/x509

Published Aug 1, 2022 · Updated Sep 8, 2026 · Also known as BIT-golang-2020-0601, Chain of Fools, ChainOfFools, Curveball, GO-2022-0535

Key Facts

Patch immediately

CVE-2020-0601 is a high-severity vulnerability (CVSS 8.1 v3.1) affecting Go (Golang), Windows (Microsoft), Windows 10 1507 (Microsoft) and 22 more products.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 14, 2020 and is known to be used in ransomware campaigns. Public exploit code is available.
EPSS estimates a 89% probability of exploitation in the next 30 days.
Fixed versions are available, including containerd 1.3.3-r0, golang 1.12.16, golang 1.13.7.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

8.1

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

EPSS (30-day exploit likelihood)

89%

Higher than 99.7% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings, used by ransomware

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2020-0601 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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'.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Nov 3, 2021	May 3, 2022	Not reported
Industry KEV feed	Jan 14, 2020	May 3, 2022	Known
CIRCL KEV	Nov 3, 2021	May 3, 2022	Not reported
ENISA EUVD	Nov 3, 2021	n/a	Not reported

Required action: Apply updates per vendor instructions.

Affected Products

53 affected entries in total

Product	Affected versions	Fixed in
GoGolang	See advisory	1.12.16
WindowsMicrosoft	>= 10 Version 1803 for 32-bit Systems	n/a
Windows 10 1507Microsoft	See advisory	n/a
Windows 10 1607Microsoft	See advisory	n/a
Windows 10 1709Microsoft	See advisory	n/a

20 more affected products in the full CVE brief

Patched Releases

containerd

1.3.3-r0

golang

1.12.16, 1.13.7

1.12.16

stdlib

1.12.16, 1.13.7

Timeline

Added to Industry KEV feed
Jan 14, 2020
Added to CISA KEV
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Publicly disclosed
Aug 1, 2022
Last updated
Sep 8, 2026

Weakness Type

CWE-295 Improper Certificate Validation

References

13 more references in the full CVE brief

FAQ

Common Questions.

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, ak…
Affected: Go (Golang); Windows (Microsoft) versions >= 10 Version 1803 for 32-bit Systems; Windows 10 1507 (Microsoft), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 14, 2020 and is known to be used in ransomware campaigns.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.
Public exploit code is available.
Fixed versions are available, including containerd 1.3.3-r0, golang 1.12.16, golang 1.13.7.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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