CVE-2021-25748 HIGH

CVE-2021-25748: Ingress-nginx `path` sanitization can be bypassed with newline character

Vendor Kubernetes
Product Kubernetes ingress-nginx
Weakness CWE-20 · Input validation
Published May 24, 2023
Last update January 16, 2025

CVSS base score

7.6/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

A security issue was discovered in ingress-nginx where a user that can create or update ingress objects can use a newline character to bypass the sanitization of the `spec.rules[].http.paths[].path` field of an Ingress object (in the `networking.k8s.io` or `extensions` API group) to obtain the credentials of the ingress-nginx controller. In the default configuration, that credential has access to all secrets in the cluster.

Key dates

02Disclosure timeline

May 24, 2023 CVE published
January 16, 2025 Record updated

Related vulnerabilities

04Related CVE