CVE-2021-31920

MEDIUM

Istio < 1.8.6 and 1.9.x < 1.9.5 - Authorization Policy Bypass via Path Manipulation

Title source: llm
STIX 2.1

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.

References (1)

Core 1
Core References
Exploit, Vendor Advisory x_refsource_confirm
https://istio.io/latest/news/security/istio-security-2021-005/

Scores

CVSS v3 6.5
EPSS 0.0117
EPSS Percentile 63.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Details

CWE
CWE-706
Status published
Products (2)
istio/istio < 1.8.6
istio.io/istio 0 - 1.8.6Go
Published May 27, 2021
Tracked Since Feb 18, 2026