CVE-2021-31921

CRITICAL

Istio < 1.8.6 and 1.9.x < 1.9.5 - Missing Authorization via AUTO_PASSTHROUGH Gateway Routing

Title source: llm
STIX 2.1

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.

References (1)

Core 1
Core References
Exploit, Vendor Advisory x_refsource_misc
https://istio.io/latest/news/security/istio-security-2021-006/

Scores

CVSS v3 9.8
EPSS 0.0145
EPSS Percentile 70.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-862
Status published
Products (1)
istio/istio < 1.8.6
Published Jun 02, 2021
Tracked Since Feb 18, 2026