Kubernetes ingress-nginx spec.rules[].http.paths[].path access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.8$0-$5k0.00

Summaryinfo

A vulnerability has been found in Kubernetes ingress-nginx and classified as critical. Affected is an unknown function. This manipulation of the argument spec.rules[].http.paths[].path causes access control. This vulnerability is registered as CVE-2021-25748. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability has been found in Kubernetes ingress-nginx (Virtualization Software) (the affected version unknown) and classified as critical. Affected by this vulnerability is an unknown part. The manipulation of the argument spec.rules[].http.paths[].path with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was published 05/24/2023 as 8686. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2021-25748 since 01/21/2021. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-1500). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.8

VulDB Base Score: 6.3
VulDB Temp Score: 6.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CNA Base Score: 7.6
CNA Vector (Kubernetes): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/21/2021 🔍
05/24/2023 +852 days 🔍
05/24/2023 +0 days 🔍
07/13/2025 +781 days 🔍

Sourcesinfo

Product: github.com

Advisory: 8686
Status: Confirmed

CVE: CVE-2021-25748 (🔍)
GCVE (CVE): GCVE-0-2021-25748
GCVE (VulDB): GCVE-100-229855
EUVD: 🔍

Entryinfo

Created: 05/24/2023 19:44
Updated: 07/13/2025 21:07
Changes: 05/24/2023 19:44 (49), 06/17/2023 09:46 (11), 07/13/2025 21:07 (16)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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