CVE-2022-21679

Name: CVE-2022-21679
Creator: NVD / NIST
Published: 2022-01-19T22:15:09.397+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.07%

Last modified Jun 17, 2026

CVE-2022-21679 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 1.07% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.07%

60.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Istio	Istio	1.12.0
Istio	Istio	1.12.1

References

https://github.com/istio/istio/security/advisories/GHSA-rwfr-xrvw-2rvvThird Party Advisory
https://istio.io/latest/news/releases/1.12.x/announcing-1.12.2/Release Notes, Vendor Advisory
https://github.com/istio/istio/security/advisories/GHSA-rwfr-xrvw-2rvvThird Party Advisory
https://istio.io/latest/news/releases/1.12.x/announcing-1.12.2/Release Notes, Vendor Advisory

Timeline

Published: Jan 19, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-21679?

How severe is CVE-2022-21679?

CVE-2022-21679 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.07% probability of exploitation in the next 30 days.

How do I fix CVE-2022-21679?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-21679?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST