CVE-2021-25748

mediumpriority · track · 26EPSS 0.007 · 53 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.69% (53rd) EPSS

CVSS 6.5 · medium

Is it mine?

4 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

A security issue was discovered in ingress-nginx where a user that can create or update ingress objects can use a newline character to bypass the sanitization of the `spec.rules[].http.paths[].path` field of 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.

cvss

Technical severity, 0–10. One row per scoring source.

7.6

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6–7.6

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.17.6highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:Lsecondary · ENISA EU

v3.17.6highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:Lsecondary · jordan@liggitt.netexploitability 2.8 · impact 4.7

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondary · OSV

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USCWE-20US

affected products (4)

Products and version ranges known to be affected.

Juniper JUNOSall versionscert_bundDEcpe:/o:juniper:junos:-
Kubernetes Kubernetes ingress-nginxunspecified → 1.2.1enisa_euvdEU
kubernetes ingress-nginx< 1.2.1nvdUScpe:2.3:a:kubernetes:ingress-nginx:*:*:*:*:*:*:*:*
Go k8s.io/ingress-nginx< 1.2.1osvUSpkg:golang/k8s.io/ingress-nginx

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2024-1591Juniper JUNOS: Mehrere SchwachstellenDeutsch2024-07-10csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Juniper JUNOS ausnutzen, um einen Denial of Service zu verursachen, Informationen offenzulegen, Privilegien zu erweitern und Sicherheitsmechanismen inklusive zu umgehen.
GHSA-863x-868h-968xIngress-nginx `path` sanitization can be bypassed with newline character2023-05-24ghsa · osvUS
A security issue was discovered in ingress-nginx where a user that can create or update ingress objects can use a newline character to bypass the sanitization of the `spec.rules[].http.paths[].path` field of 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.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd osv NVD CVE.org MITRE

published 2023-05-24modified 2026-06-17

references (7)

External citations — patches, advisories, analysis.

https://cxsecurity.com/cveshow/CVE-2021-25748/cnnvd
https://github.com/kubernetes/ingress-nginx/issues/8686 cnnvd
https://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8 cnnvd
https://github.com/kubernetes/ingress-nginx/issues/8686 enisa_euvd
https://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8 enisa_euvd
https://github.com/kubernetes/ingress-nginx/issues/8686Issue TrackingMitigationVendor Advisorynvd
https://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8Mailing ListMitigationVendor Advisorynvd

scry

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