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High severityNVD Advisory· Published Feb 22, 2022· Updated Apr 23, 2025

Unauthenticated control plane denial of service attack in Istio

CVE-2022-23635

Description

Istio is an open platform to connect, manage, and secure microservices. In affected versions the Istio control plane, istiod, is vulnerable to a request processing error, allowing a malicious attacker that sends a specially crafted message which results in the control plane crashing. This endpoint is served over TLS port 15012, but does not require any authentication from the attacker. For simple installations, Istiod is typically only reachable from within the cluster, limiting the blast radius. However, for some deployments, especially multicluster topologies, this port is exposed over the public internet. There are no effective workarounds, beyond upgrading. Limiting network access to Istiod to the minimal set of clients can help lessen the scope of the vulnerability to some extent.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
istio.io/istioGo
>= 1.13.0, < 1.13.11.13.1
istio.io/istioGo
>= 1.12.0, < 1.12.41.12.4
istio.io/istioGo
< 1.11.71.11.7

Affected products

57

Patches

Vulnerability mechanics

References

5

News mentions

0

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