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Vulnerabilities / CVE-2021-31921

critical

CVE-2021-31921

istio/istio: authorization bypass when using AUTO_PASSTHROUGH

Published Modified CWE 862
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Red Hat (high), Oracle (high).

Description

Istio before 1.8.6 and 1.9.x before 1.9.5 contains a remotely exploitable vulnerability where an external client can access unexpected services in the cluster, bypassing authorization checks, when a gateway is configured with AUTO_PASSTHROUGH routing configuration.

Affected packages and fixed versions

SourcePackageFixed in
Oracle Linux 7istio, istio-istioctl, kubeadm and 11 more1.10.2-2.el7 and 2 more
Oracle Linux 8istio, istio-istioctl, istio-pilot-agent and 13 more1.10.2-2.el8 and 3 more
Show all 30 entries from 2 sources
SourcePackageFixed in
Oracle Linux 7istio1.10.2-2.el7
Oracle Linux 7istio-istioctl1.10.2-2.el7
Oracle Linux 7kubeadm1.20.6-2.el7
Oracle Linux 7kubectl1.20.6-2.el7
Oracle Linux 7kubelet1.20.6-2.el7
Oracle Linux 7olcne-agent1.3.1-5.el7
Oracle Linux 7olcne-api-server1.3.1-5.el7
Oracle Linux 7olcne-grafana-chart1.3.1-5.el7
Oracle Linux 7olcne-istio-chart1.3.1-5.el7
Oracle Linux 7olcne-nginx1.3.1-5.el7
Oracle Linux 7olcne-olm-chart1.3.1-5.el7
Oracle Linux 7olcne-prometheus-chart1.3.1-5.el7
Oracle Linux 7olcne-utils1.3.1-5.el7
Oracle Linux 7olcnectl1.3.1-5.el7
Oracle Linux 8istio1.10.2-2.el8
Oracle Linux 8istio-istioctl1.10.2-2.el8
Oracle Linux 8istio-pilot-agent1.9.6-2.el8
Oracle Linux 8istio-pilot-discovery1.9.6-2.el8
Oracle Linux 8kubeadm1.20.6-2.el8
Oracle Linux 8kubectl1.20.6-2.el8
Oracle Linux 8kubelet1.20.6-2.el8
Oracle Linux 8olcne-agent1.3.1-5.el8
Oracle Linux 8olcne-api-server1.3.1-5.el8
Oracle Linux 8olcne-grafana-chart1.3.1-5.el8
Oracle Linux 8olcne-istio-chart1.3.1-5.el8
Oracle Linux 8olcne-nginx1.3.1-5.el8
Oracle Linux 8olcne-olm-chart1.3.1-5.el8
Oracle Linux 8olcne-prometheus-chart1.3.1-5.el8
Oracle Linux 8olcne-utils1.3.1-5.el8
Oracle Linux 8olcnectl1.3.1-5.el8

References

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.