What’s Vulnerable › Vulnerabilities

CVE-2021-25742: Ingress-nginx custom snippets allows retrieval of ingress-nginx serviceaccount token and secrets across all namespaces

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-10-29 · 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 the custom snippets feature to obtain all secrets in the cluster.

Affected products

• Kubernetes ingress-nginx: before 0.49.1; 1.0.0 — fixed in 0.49.1
• NetApp Trident: all versions

How to fix

Upgrade to a fixed version: Kubernetes ingress-nginx 0.49.1. Check the vendor advisory for mitigations.

References

• https://github.com/kubernetes/ingress-nginx/issues/7837
• https://groups.google.com/g/kubernetes-security-announce/c/mT4JJxi9tQY
• https://security.netapp.com/advisory/ntap-20211203-0001/
• https://github.com/kubernetes/ingress-nginx/issues/7837
• https://groups.google.com/g/kubernetes-security-announce/c/mT4JJxi9tQY
• https://security.netapp.com/advisory/ntap-20211203-0001/

Get alerted when CVE-2021-25742 or the next vulnerability affects your stack