What’s Vulnerable › Vulnerabilities

CVE-2021-25746: Ingress-nginx directive injection via annotations

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-05-06 · updated 2026-06-17
• Weakness: CWE-20

Description

A security issue was discovered in ingress-nginx where a user that can create or update ingress objects can use .metadata.annotations in 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.

Affected products

• Kubernetes ingress-nginx: before 1.2.0 — fixed in 1.2.0

How to fix

Upgrade to a fixed version: Kubernetes ingress-nginx 1.2.0. Check the vendor advisory for mitigations.

References

• https://github.com/kubernetes/ingress-nginx/issues/8503
• https://groups.google.com/g/kubernetes-security-announce/c/hv2-SfdqcfQ
• https://security.netapp.com/advisory/ntap-20220609-0006/
• https://github.com/kubernetes/ingress-nginx/issues/8503
• https://groups.google.com/g/kubernetes-security-announce/c/hv2-SfdqcfQ
• https://security.netapp.com/advisory/ntap-20220609-0006/

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