CVE-2021-3538

Name: CVE-2021-3538
Creator: NVD / NIST
Published: 2021-06-02T14:15:09.993+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.31%

Last modified Jun 17, 2026

CVE-2021-3538 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A flaw was found in github.com/satori/go.uuid in versions from commit 0ef6afb2f6cdd6cdaeee3885a95099c63f18fc8c to d91630c8510268e75203009fe7daf2b8e1d60c45. Due to insecure randomness in the g.rand.Read function the generated UUIDs are predictable for an attacker.. EPSS estimates a 2.31% chance of exploitation in the next 30 days.

Description

A flaw was found in github.com/satori/go.uuid in versions from commit 0ef6afb2f6cdd6cdaeee3885a95099c63f18fc8c to d91630c8510268e75203009fe7daf2b8e1d60c45. Due to insecure randomness in the g.rand.Read function the generated UUIDs are predictable for an attacker.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.31%

81.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Satori	Uuid	All versions

References

https://bugzilla.redhat.com/show_bug.cgi?id=1954376Issue Tracking, Third Party Advisory
https://github.com/satori/go.uuid/issues/73Third Party Advisory
https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMSATORIGOUUID-72488Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1954376Issue Tracking, Third Party Advisory
https://github.com/satori/go.uuid/issues/73Third Party Advisory
https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMSATORIGOUUID-72488Third Party Advisory

Timeline

Published: Jun 2, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3538?

How severe is CVE-2021-3538?

CVE-2021-3538 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.31% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3538?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3538?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST