---
id: CVE-2022-23635
title: 'Istio is an open platform to connect, manage, and secure microservices'
summary: >-
  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 mes…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-287
  - CWE-1284
vendor: istio
product: istio
affected:
  - istio < 1.11.7
  - 'istio >= 1.12.0, < 1.12.4'
  - 'istio >= 1.13.0, < 1.13.1'
patched:
  - istio 1.13.1
published: '2022-02-22'
updated: '2026-06-17'
sourceUpdated: '2026-06-17T04:30:31.893'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2022-23635'
references:
  - url: >-
      https://github.com/istio/istio/commit/5f3b5ed958ae75156f8656fe7b3794f78e94db84
    label: security-advisories@github.com
  - url: 'https://github.com/istio/istio/security/advisories/GHSA-856q-xv3c-7f2f'
    label: security-advisories@github.com
  - url: 'https://istio.io/latest/news/security/istio-security-2022-003'
    label: security-advisories@github.com
  - url: >-
      https://github.com/istio/istio/commit/5f3b5ed958ae75156f8656fe7b3794f78e94db84
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/istio/istio/security/advisories/GHSA-856q-xv3c-7f2f'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://istio.io/latest/news/security/istio-security-2022-003'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2025-04-23T15:57:30.373660Z'
ingestedAt: '2026-09-14T14:05:46.585Z'
epss: 0.01664
epssPercentile: 0.75699
---

## Overview

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.

## Affected

- `istio < 1.11.7`
- `istio >= 1.12.0, < 1.12.4`
- `istio >= 1.13.0, < 1.13.1`

## Remediation

Upgrade past the affected range:

- `istio 1.13.1`