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CVE-2021-3538

32
FAUCET Score

CVE-2021-3538 describes a critical vulnerability in the github.com/satori/go.uuid library, affecting versions between specific commit hashes. This flaw, categorized as CWE-338 (Insufficient Entropy), allows attackers to predict generated UUIDs due to insecure randomness in the g.rand.Read function. With a CVSS score of 9.8 (Critical), the vulnerability is easily exploitable over the network with low complexity, potentially leading to complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the CVE has garnered significant community discussion, indicating awareness among security professionals.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:a:satori:uuid:-:*:*:*:*:go:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.31%
Probability of exploitation in next 30 days
EPSS Percentile
81.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0231 is in the 71st percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

gopatch availablevia ghsa
Product: github.com/satori/go.uuidFixed in: 1.2.1-0.20180404165556-75cca531ea76
redhatno patchvia redhat_api
Product: Red Hat OpenStack Platform 16.2Fixed in: smart-gateway-container

Vendor Advisories (2)

goGHSA-33m6-q9v5-62r7critical

go.uuid has Predictable UUID Identifiers

Feb 7, 2023
redhatCVE-2021-3538Moderate

satori/go.uuid: predictable UUIDs generated via insecure randomness

Mar 24, 2018

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory
github.com / satori/go.uuid/issues/73
Third Party Advisory
snyk.io / vuln/SNYK-GOLANG-GITHUBCOMSATORIGOUUID-72488
Third Party Advisory