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CVE-2021-25748

7.6 · HIGH

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…

Published May 24, 2023CWE-20EPSS 0.69%

Overview

CVE-2021-25748 is a high-severity vulnerability. It was published on May 24, 2023 and has a CVSS 3.1 base score of 7.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.6, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/kubernetes/ingress-nginx/issues/8686Refgroups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8GitHubgithub.com/kubernetes/ingress-nginx/issues/8686Refgroups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8

How CyberStrike helps

Frequently asked questions

What is CVE-2021-25748?

CVE-2021-25748 is a high-severity vulnerability. It was published on May 24, 2023 and has a CVSS 3.1 base score of 7.6 (HIGH).

How severe is CVE-2021-25748?

This vulnerability has a CVSS 3.1 base score of 7.6, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-25748?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-25748?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-25748 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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