CVE-2021-31920

2021-05-1120:55:56

redhat.com

access.redhat.com

istio

authorization bypass

http request

escaped characters

uri path

data confidentiality

integrity

system availability

cve-2021-31920

CVSS2

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS3

8.3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

LOW

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

EPSS

0.004

Percentile

73.9%

JSON

An authorization bypass flaw was found in Istio. This flaw allows an attacker to craft an HTTP request that defines a certain pattern of escaped characters in the URI path (such as %2F, %2f, %5C, or %5c), allowing them to bypass the authorization service. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.