CVE-2021-25737 — Incomplete List of Disallowed Inputs in Kubernetes

CWE-184 — Incomplete List of Disallowed InputsCWE-601 — Open RedirectCWE-20 — Improper Input Validation8 documents6 sources
Severity
4.8MEDIUMNVD
CNA2.7
EPSS
0.4%
top 40.56%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
KubernetesK8s.io Kubernetes
Timeline
PublishedSep 6
Latest updateAug 21

Description

A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:NExploitability: 1.7 | Impact: 2.7

Affected Packages4 packages

▶Gok8s.io/kubernetes1.16.0 — 1.18.19+3
▶NVDkubernetes/kubernetes1.16.0 — 1.18.19+3
▶Debiankubernetes/kubernetes< 1.20.5+really1.20.2-1+3
▶CVEListV5kubernetes/kubernetesunspecified — 1.18.18+3

Patches

Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

5
OSV
Incomplete List of Disallowed Inputs in Kubernetes in k8s.io/kubernetes↗2024-08-21
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OSV
Incomplete List of Disallowed Inputs in Kubernetes↗2021-09-07
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GHSA
Incomplete List of Disallowed Inputs in Kubernetes↗2021-09-07
▶
CVEList
Holes in EndpointSlice Validation Enable Host Network Hijack↗2021-09-06
▶
OSV
CVE-2021-25737: A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node↗2021-09-06
▶

📋Vendor Advisories

2
Red Hat
kubernetes: Holes in EndpointSlice Validation Enable Host Network Hijack↗2021-05-18
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Debian
CVE-2021-25737: kubernetes - A security issue was discovered in Kubernetes where a user may be able to redire...↗2021
▶
CVE-2021-25737 — Incomplete List of Disallowed Inputs | cvebase