What’s Vulnerable › Vulnerabilities

CVE-2021-25741: Symlink Exchange Can Allow Host Filesystem Access

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 8.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-20 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• Kubernetes: through 1.19.14; from 1.20.0 through 1.20.10; from 1.21.0 through 1.21.4; from 1.22.0 through 1.22.1

References

• https://github.com/kubernetes/kubernetes/issues/104980
• https://groups.google.com/g/kubernetes-security-announce/c/nyfdhK24H7s
• https://security.netapp.com/advisory/ntap-20211008-0006/
• https://github.com/kubernetes/kubernetes/issues/104980
• https://groups.google.com/g/kubernetes-security-announce/c/nyfdhK24H7s
• https://security.netapp.com/advisory/ntap-20211008-0006/

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