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Case File

CVE-2021-31921

CRITICAL · CVSS 9.8 EPSS 1.45% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-06-02 · Last synced 2026-08-04

CyberRota Analysis

This is a critical severity vulnerability with a CVSS score of 9.8. Public exploit code or proof-of-concept references have been detected in its references. It may be remotely exploitable.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-31921
Severity
CRITICAL
CVSS
9.8
EPSS
1.45%

Original 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.

Related CVEs

Other vulnerabilities affecting the same vendor(s)