CVE-2022-23635

Name: CVE-2022-23635
Creator: NVD / NIST
Published: 2022-02-22T22:15:07.62+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.59%

Last modified Jun 17, 2026

CVE-2022-23635 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 1.59% chance of exploitation in the next 30 days.

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](https://istio.io/latest/docs/setup/install/multicluster/primary-remote/) 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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.59%

72.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Istio	Istio	< 1.11.7
Istio	Istio	>= 1.12.0, < 1.12.4
Istio	Istio	>= 1.13.0, < 1.13.1

References

https://github.com/istio/istio/commit/5f3b5ed958ae75156f8656fe7b3794f78e94db84Patch, Third Party Advisory
https://github.com/istio/istio/security/advisories/GHSA-856q-xv3c-7f2fIssue Tracking, Third Party Advisory
https://istio.io/latest/news/security/istio-security-2022-003Third Party Advisory
https://github.com/istio/istio/commit/5f3b5ed958ae75156f8656fe7b3794f78e94db84Patch, Third Party Advisory
https://github.com/istio/istio/security/advisories/GHSA-856q-xv3c-7f2fIssue Tracking, Third Party Advisory
https://istio.io/latest/news/security/istio-security-2022-003Third Party Advisory

Timeline

Published: Feb 22, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-23635?

How severe is CVE-2022-23635?

CVE-2022-23635 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.59% probability of exploitation in the next 30 days.

How do I fix CVE-2022-23635?

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-2022-23635?

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

Scan your code now

Source: NVD / NIST