How severe is CVE-2021-25742?

CVE-2021-25742 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.

Is CVE-2021-25742 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-25742?

CVE-2021-25742 primarily affects Kubernetes Ingress-nginx. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-25742?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-25742 published?

CVE-2021-25742 was published on 2021-10-29 and last updated on 2026-06-17.

CVE-2021-25742

CVE-2021-25742 is a high-severity vulnerability in Kubernetes Ingress-nginx with a CVSS 3.x base score of 7.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 7.6)
CVSS v2: 5.5
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Kubernetes Ingress-nginx
Published: 2021-10-29
Last modified: 2026-06-17

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.

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.
How severe is CVE-2021-25742?: CVE-2021-25742 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.
Is CVE-2021-25742 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-25742?: CVE-2021-25742 primarily affects Kubernetes Ingress-nginx. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-25742?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-25742 published?: CVE-2021-25742 was published on 2021-10-29 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:kubernetes:ingress-nginx:*:*:*:*:*:*:*:*
cpe:2.3:a:kubernetes:ingress-nginx:1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:netapp:trident:-:*:*:*:*:*:*:*

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