CVE-2021-31921: Critical severity istio vulnerability
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 AUTOPASSTHROUGH routing configuration.
Affected Software
Event History
Frequently Asked Questions
What is the vulnerability ID for this Istio vulnerability?
The vulnerability ID for this Istio vulnerability is CVE-2021-31921.
What is the severity of CVE-2021-31921?
The severity of CVE-2021-31921 is critical.
How does CVE-2021-31921 affect Istio?
CVE-2021-31921 affects Istio versions before 1.8.6 and 1.9.x before 1.9.5 where an external client can access unexpected services in the cluster, bypassing authorization checks.
How can an attacker exploit CVE-2021-31921?
An attacker can exploit CVE-2021-31921 by leveraging an external client to access unexpected services in the cluster without proper authorization.
Are there any fixes available for CVE-2021-31921?
Yes, fixes are available for CVE-2021-31921. Upgrade to Istio version 1.8.6 or higher, or 1.9.5 or higher to mitigate the vulnerability.