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CVE-2021-25741

HighPublished

Symlink Exchange Can Allow Host Filesystem Access

Published: Sep 20, 2021
Updated: Sep 16, 2024
Assigning CNA: kubernetes
Evidence observed: Aug 8, 2026

Primary CVSS

8.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

8.0%

Low · next 30 days

Percentile: 94.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2021-25741Exploit
Exploit for CVE-2021-25741 Kubernetes vulnerability allowing host filesystem mount into pods via race condition, with deployment scripts and technical details.
ZigRaceExploitPoC
CVE-2021-25741 POC in Zig
CVE-2021-25741PoC
Proof-of-concept exploit for CVE-2021-25741 enabling Kubernetes container escape via subpath volume mount manipulation, designed for security testing and vulnerability validation.

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