Files or Directories Accessible to External Parties in kubernetes (CVE-2021-25741) | HOL Guard CVE

High · CVSS 8.1CVE-2021-25741GHSA-F5F7-6478-QM6P

Files or Directories Accessible to External Parties in kubernetes

Answer in brief

CVE-2021-25741 records a High severity (CVSS 8.1) vulnerability in Files or Directories Accessible to External Parties in kubernetes. The current sources do not mark it as known exploited. The current feed maps k8s.io/kubernetes (go), k8s.io/kubernetes (go), k8s.io/kubernetes (go), k8s.io/kubernetes (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 1, 2021Updated Sep 10, 2026Source checked Sep 10, 2026First seen by HOL Sep 10, 2026Material review Sep 10, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.1
Exploitation: Not marked as known exploited
Affected software: 4 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps k8s.io/kubernetes (go), k8s.io/kubernetes (go), k8s.io/kubernetes (go), k8s.io/kubernetes (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
k8s.io/kubernetesgo	>=0 <1.19.15	1.19.15
k8s.io/kubernetesgo	>=1.20.0 <1.20.11	1.20.11
k8s.io/kubernetesgo	>=1.21.0 <1.21.5	1.21.5
k8s.io/kubernetesgo	>=1.22.0 <1.22.2	1.22.2

Recommended response

Check inventory. Check lockfiles and deployed manifests for k8s.io/kubernetes, k8s.io/kubernetes, k8s.io/kubernetes.
Review the reported fix. Update k8s.io/kubernetes to 1.19.15; k8s.io/kubernetes to 1.20.11; k8s.io/kubernetes to 1.21.5; k8s.io/kubernetes to 1.22.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Nov 1, 2021
Evidence: source:osv:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:record
First seen by HOL
Sep 10, 2026

Sources and claim methodology

Upstream source description

A security issue was discovered in Kubernetes where a user may be able to create a container with subpath volume mounts to access files & directories outside of the volume, including on the host filesystem.

Quoted source text, attributed separately from HOL analysis.