CVE-2021-25742: A security issue was discovered in ingress-nginx where a user that can create or update ingress objects can us

Q: How do I fix CVE-2021-25742?

ingress-nginx: upgrade to 0.49.1; trident: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2021-25742 being exploited?

CVE-2021-25742 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-25742 affect?

CVE-2021-25742 affects ingress-nginx, trident. Severity is high (CVSS 7.6). 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.

Q: How urgent is CVE-2021-25742?

Priority 57/100. High severity; Public exploit reference; On your watchlist

This month

HIGH 7.6WATCHLISTUPGRADEMITIGATE

CVE-2021-25742 is a high-severity flaw (CVSS 7.6) affecting ingress-nginx, trident. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.1% (top 19%)
CISA exploited list	No
Weakness	CWE-20
Published	2021-10-29
Last modified	2026-06-17

Publisher (CNA): Kubernetes · Vendor: kubernetes · netapp

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-10-29 04:15 UTCPublished CVE record published
2026-06-17 03:42 UTCUpdated Record last modified

kubernetes ingress-nginx UPGRADE

Affected: < 0.49.1 · 1.0.0

Fixed in: 0.49.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ingress-nginx || rpm -q ingress-nginx || ingress-nginx --version

2. UPGRADE to 0.49.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ingress-nginx

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ingress-nginx

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

netapp trident MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy trident || rpm -q trident || trident --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-25742?

ingress-nginx: upgrade to 0.49.1; trident: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-25742 being exploited?

CVE-2021-25742 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-25742 affect?

CVE-2021-25742 affects ingress-nginx, trident. Severity is high (CVSS 7.6). 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.

How urgent is CVE-2021-25742?

Priority 57/100. High severity; Public exploit reference; On your watchlist

Software pages

nginx vulnerabilities · Kubernetes vulnerabilities

Related CVEs

CVE-2026-3288 HIGH 8.8 UPGRADE A security issue was discovered in ingress-nginx where the `nginx.ingress.kubernetes.io/rewrite-target` Ingres
CVE-2023-5044 HIGH 7.6 UPGRADE Code injection via nginx.ingress.kubernetes.io/permanent-redirect annotation.
CVE-2023-5043 HIGH 7.6 UPGRADE Ingress nginx annotation injection causes arbitrary command execution.
CVE-2022-4886 HIGH 8.8 UPGRADE Ingress-nginx `path` sanitization can be bypassed with `log_format` directive.
CVE-2021-25748 HIGH 7.6 UPGRADE A security issue was discovered in ingress-nginx where a user that can create or update ingress objects can us

References

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