Is CVE-2022-21679 actively exploited?

No active exploitation of CVE-2022-21679 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2022-21679 be exploited remotely?

Yes. CVE-2022-21679 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2022-21679?

CVE-2022-21679 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2022-21679

CWE-670Published: January 19, 2022· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

Istio is an open platform to connect, manage, and secure microservices. In Istio 1.12.0 and 1.12.1 The authorization policy with hosts and notHosts might be accidentally bypassed for ALLOW action or rejected unexpectedly for DENY action during the upgrade from 1.11 to 1.12.0/1.12.1. Istio 1.12 supports the hosts and notHosts fields in authorization policy with a new Envoy API shipped with the 1.12 data plane. A bug in the 1.12.0 and 1.12.1 incorrectly uses the new Envoy API with the 1.11 data plane. This will cause the hosts and notHosts fields to be always matched regardless of the actual value of the host header when mixing 1.12.0/1.12.1 control plane and 1.11 data plane. Users are advised to upgrade or to not mix the 1.12.0/1.12.1 control plane with 1.11 data plane if using hosts or notHosts field in authorization policy.

NVD Source

Technical Analysis

CVE-2022-21679 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.