CVE-2021-31921

PoC —

CVSS 3.1

9.8 critical

EPSS

1%p72

Published

Jun 2, 2021 (Jun 2, 2021)

Modified

Jun 17, 2026

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.

Vendors: istio
Products: istio
Weakness: CWE-862
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (1.5%)

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