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Fencer Vulns
critical 9.8

CVE-2021-3538 json

go.uuid has Predictable UUID Identifiers

published 2021-06-02 5 y ago modified 2026-06-17 4 mo ago also GHSA-33m6-q9v5-62r7 , GO-2022-0244 , EUVD-2023-0607

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

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.

Patch / fix

  • go github.com/satori/go.uuid 1.2.1-0.20180404165556-75cca531ea76

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3538 updated cvss 9.8

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

  • Red Hat OpenStack Platform 16.2 smart-gateway-container
    affected: no fix available
  • Red Hat Migration Toolkit for Containers rhmtc/openshift-migration-velero-rhel8, rhmtc/openshift-migration-registry-rhel8, rhmtc/openshift-migration-controller-rhel8, rhmtc/openshift-migration-velero-plugin-for-gcp-rhel8, rhmtc/openshift-migration-velero-plugin-for-microsoft-azure-rhel8 Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/search-rhel8, rhacm2/subctl-rhel9, rhacm2/thanos-rhel7, rhacm2/acm-grafana-rhel8, rhacm2/observatorium-rhel8, rhacm2/openshift-hive-rhel8, +33 more Red Hat OpenShift Container Platform 4 openshift, openshift-clients, openshift-kubelet, openshift-hyperkube, openshift4/ose-tests, openshift-kube-apiserver, +17 more Red Hat OpenShift Container Platform Assisted Installer 1 rhai-tech-preview/assisted-installer-rhel8, rhai-tech-preview/assisted-installer-agent-rhel8, rhai-tech-preview/assisted-installer-reporter-rhel8 Red Hat Openshift Container Storage 4 mcg, ocs4/cephcsi-rhel8, ocs4/mcg-rhel8-operator, ocs4/ocs-rhel8-operator, ocs4/ocs-must-gather-rhel8, ocs4/rook-ceph-rhel8-operator Red Hat OpenShift Virtualization 2 ovs-cni-marker-container, ovs-cni-plugin-container, vm-import-virtv2v-container, vm-import-operator-container, node-maintenance-operator-container, kubernetes-nmstate-handler-container, +6 more
    +3 more products
    Red Hat OpenShift Virtualization 4 container-native-virtualization/ovs-cni-marker, container-native-virtualization/ovs-cni-plugin, container-native-virtualization/vm-import-virtv2v-rhel8, container-native-virtualization/vm-import-operator-rhel8, container-native-virtualization/node-maintenance-operator, container-native-virtualization/vm-import-controller-rhel8, +5 more Red Hat OpenStack Platform 16.1 smart-gateway-container Red Hat Quay 3 quay/clair-rhel8, quay/quay-builder-rhel8, quay/quay-operator-rhel8
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.31% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
go github.com/satori/go.uuid
>=1.2.1-0.20180103161547-0ef6afb2f6cd, <1.2.1-0.20180404165556-75cca531ea76
1.2.1-0.20180404165556-75cca531ea76

Affected products

  • n/a satori/go.uuid

Classification

Weakness
  • CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

References

Sources

Fencer Vulns 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.