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No exploitation reportedFix available

CVE-2021-25742

No exploitation reported by the sources we read.

  • Published2021-10-29
  • Fixed in0.49.1
  • WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2021-10-2904:15CVE publishedNVD

Versions per branch

NVD
Kubernetes ingress-nginx
BranchAffectedFixed in
0.49< 0.49.10.49.1
1.0= 1.0.0no fix published
Netapp trident
BranchAffectedFixed in
—all versionsno fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • rkeopenSUSE:Tumbleweedall versions · fixed in 1.3.3-1.1
  • rkeCleanStartall versions · fixed in 1.3.2-r0

Vendor advisories

  • CVE-2021-25742 Red Hat Product Security

    k8s.io/ingress-nginx: Custom snippets allows retrieval of ingress-nginx serviceaccount token and secrets across all namespaces

Full record on NVD

Fix

  1. Update Kubernetes ingress-nginx to 0.49.1

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.17.6known since 2026-10-23
  • NVDCVSS 3.17.1read 2026-10-23
  • NVDCVSS 2.05.5read 2026-10-23
  • CNAweakness (CWE)CWE-20known since 2026-10-23
  • FIRST EPSSEPSS score2.1 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Published
2021-10-29
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-4pp2-3663-mcw8

Frequently asked questions

What is CVE-2021-25742?

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.

Is CVE-2021-25742 actively exploited?

Active exploitation of CVE-2021-25742 has not been confirmed. Its EPSS score was 2.1% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-25742?

CVE-2021-25742 has a CVSS v3 base score of 7.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.

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