Certificate verification error on Windows in crypto/x509

published 2020-07-17 6y ago modified 2026-09-08 2mo ago also BIT-golang-2020-14039 , EUVD-2020-6205 , GO-2021-0223

cvss: 5.3; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.8%; EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits: 0; none known

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.

Patch / fix

fixed in 3 distros 2 links 3

bitnami golang 1.13.13, 1.14.5
go stdlib 1.13.13, 1.14.5
golang go 1.13.13, 1.14.5

suse opensuse

terraform SLE Module for Public Cloud 15 SP2 0.13.4-6.3.1
terraform-provider-aws SLE Module for Public Cloud 15 SP2 3.11.0-6.3.1
terraform-provider-tls SLE Module for Public Cloud 15 SP2 3.0.0-5.3.2
terraform-provider-helm SLE Module for Public Cloud 15 SP2 1.3.2-6.3.1
terraform-provider-null SLE Module for Public Cloud 15 SP2 3.0.0-6.3.1
terraform-provider-local SLE Module for Public Cloud 15 SP2 2.0.0-6.3.1
terraform-provider-google SLE Module for Public Cloud 15 SP2 3.43.0-6.3.1
terraform-provider-random SLE Module for Public Cloud 15 SP2 3.0.0-6.3.1

suse advisories SUSE-SU-2021:0263-1 SUSE-SU-2020:2562-1

go1.13 openSUSE Tumbleweed 1.13.15-2.6
go1.14 openSUSE Tumbleweed 1.14.15-1.6
terraform-provider-helm openSUSE Tumbleweed 2.0.0-1.4
go1.14 openSUSE Leap 15.2 1.14.7-lp152.2.3.1
go1.14 openSUSE Leap 15.1 1.14.7-lp151.13.1
go1.13 openSUSE Leap 15.2 1.13.14-lp152.2.4.1
go1.13 openSUSE Leap 15.1 1.13.14-lp151.5.1

opensuse advisories openSUSE-SU-2024:10806-1 openSUSE-SU-2024:10807-1 openSUSE-SU-2024:11430-1 openSUSE-SU-2020:1407-1 openSUSE-SU-2020:1405-1 openSUSE-SU-2020:1095-1

go.googlesource.com/go/+/82175e699a2e2cd83d3aa34949e9b922d66d52f5 commit
go.dev/cl/242597 patch
oracle.com/security-alerts/cpuApr2021.html advisory

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Exploit prediction

1.76% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N
OSV	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
bitnami	golang	<1.13.13 >=1.14.0, <1.14.5	1.13.13 1.14.5
go	stdlib	<1.13.13 >=1.14.0-0, <1.14.5	1.13.13 1.14.5

Classification

Weakness

CWE-295 Improper Certificate Validation

References

oracle.com /security-alerts/cpuApr2021.html
patch, third-party-advisory, advisory
go.dev /cl/242597
patch
go.googlesource.com /go/+/82175e699a2e2cd83d3aa34949e9b922d66d52f5
patch
lists.opensuse.org /opensuse-security-announce/2020-07/msg00077.html
vendor-advisory, mailing-list, third-party-advisory, advisory
lists.opensuse.org /opensuse-security-announce/2020-07/msg00082.html
vendor-advisory, mailing-list, third-party-advisory, advisory
lists.opensuse.org /opensuse-security-announce/2020-09/msg00029.html
vendor-advisory, mailing-list, third-party-advisory, advisory
lists.opensuse.org /opensuse-security-announce/2020-09/msg00030.html
vendor-advisory, mailing-list, third-party-advisory, advisory
groups.google.com /forum/#%21forum/golang-announce
web
groups.google.com /forum/#%21topic/golang-announce/XZNfaiwgt2w
web
security.netapp.com /advisory/ntap-20200731-0005/
third-party-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2020-14039
web
go.dev /issue/39360
report
groups.google.com /g/golang-announce/c/XZNfaiwgt2w
web

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.