Is CVE-2021-31920 actively exploited?

CVE-2021-31920 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2021-31920?

CVE-2021-31920 has a CVSS score of 6.5 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

How do I patch CVE-2021-31920?

Patch guidance is available from istio security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-31920.

Which products are affected by CVE-2021-31920?

2 products: istio istio, istio istio.

CVE-2021-31920 - remediation guidance & executive summary

Description

Istio before 1.8.6 and 1.9.x before 1.9.5 has a remotely exploitable vulnerability where an HTTP request path with multiple slashes or escaped slash characters (%2F or %5C) could potentially bypass an Istio authorization policy when path based authorization rules are used.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack Vector: network
Complexity: low
Privileges: low
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: none
Availability: none
Weaknesses: CWE-706

Metadata

Primary Vendor: ISTIO
Published: 5/27/2021
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

istio : istioistio : istio

Remediation Guidance

Executive Summary

Cite this page

CVE-2021-31920. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2021-31920

View on NIST NVD

CVE-2021-31920 vulnerability