CVE-2021-31920

Published: May 27, 2021Modified: Jun 17, 2026

6.5

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Exploitability: 2.8 / Impact: 3.6

Source: NVD

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.

Affected (2)

Products: Istio: Istio

1 product

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Istio Istio	Before 1.8.6
Istio Istio	From 1.9.0 to 1.9.5

Related CWEs

Use of Incorrectly-Resolved Name or Reference

The product uses a name or reference to access a resource, but the name/reference resolves to a resource that is outside of the intended control sphere.

References (2)

https://istio.io/latest/news/security/istio-security-2021-005/

Source: cve@mitre.org

ExploitVendor Advisory

https://istio.io/latest/news/security/istio-security-2021-005/

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitVendor Advisory

Timeline

No history available yet.