CVE-2021-31921

Published: Jun 2, 2021Modified: Jun 17, 2026

9.8

Vector

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

Exploitability: 3.9 / Impact: 5.9

Source: NVD

Description

Istio before 1.8.6 and 1.9.x before 1.9.5 contains a remotely exploitable vulnerability where an external client can access unexpected services in the cluster, bypassing authorization checks, when a gateway is configured with AUTO_PASSTHROUGH routing configuration.

Affected (2)

Products: Istio: Istio

1 product

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Istio Istio	Before 1.8.6
Istio Istio	From 1.9.0 to 1.9.5

Related CWEs

Missing Authorization

The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

References (2)

https://istio.io/latest/news/security/istio-security-2021-006/

Source: cve@mitre.org

ExploitVendor Advisory

https://istio.io/latest/news/security/istio-security-2021-006/

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitVendor Advisory

Timeline

No history available yet.