What’s Vulnerable › Vulnerabilities

CVE-2020-14039

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-07-17 · updated 2026-06-17
• Weakness: CWE-295

Description

In Go before 1.13.13 and 1.14.x before 1.14.5, Certificate.Verify may lack a check on the VerifyOptions.KeyUsages EKU requirements (if VerifyOptions.Roots equals nil and the installation is on Windows). Thus, X.509 certificate verification is incomplete.

Affected products

• Go: before 1.13.13; from 1.14.0 before 1.14.5 — fixed in 1.13.13, 1.14.5
• openSUSE Leap: 15.1, 15.2

How to fix

Upgrade to a fixed version: Go 1.13.13, 1.14.5. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00077.html
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00082.html
• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00029.html
• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00030.html
• https://groups.google.com/forum/#%21forum/golang-announce
• https://groups.google.com/forum/#%21topic/golang-announce/XZNfaiwgt2w
• https://security.netapp.com/advisory/ntap-20200731-0005/
• https://www.oracle.com/security-alerts/cpuApr2021.html
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00077.html
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00082.html
• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00029.html
• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00030.html

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