CVE-2018-20321

Name: CVE-2018-20321
Creator: NVD / NIST
Published: 2019-04-10T14:29:00.267+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.80%

Last modified Jun 17, 2026

CVE-2018-20321 is a vulnerability of currently unknown severity. An issue was discovered in Rancher 2 through 2.1.5. Any project member with access to the default namespace can mount the netes-default service account in a pod, and then use that pod to execute administrative privileged commands against the k8s cluster. EPSS estimates a 1.80% chance of exploitation in the next 30 days.

Description

An issue was discovered in Rancher 2 through 2.1.5. Any project member with access to the default namespace can mount the netes-default service account in a pod, and then use that pod to execute administrative privileged commands against the k8s cluster. This could be mitigated by isolating the default namespace in a separate project, where only cluster admins can be given permissions to access. As of 2018-12-20, this bug affected ALL clusters created or imported by Rancher.

Metrics

EPSS Probability

1.80%

75.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-668

Affected Software

Vendor	Product	Versions
Suse	Rancher	>= 2.0.0, <= 2.1.5

References

https://forums.rancher.com/c/announcementsVendor Advisory
https://rancher.com/blog/2019/2019-01-29-explaining-security-vulnerabilities-addressed-in-rancher-v2-1-6-and-v2-0-11/Mitigation, Vendor Advisory
https://forums.rancher.com/c/announcementsVendor Advisory
https://rancher.com/blog/2019/2019-01-29-explaining-security-vulnerabilities-addressed-in-rancher-v2-1-6-and-v2-0-11/Mitigation, Vendor Advisory

Timeline

Published: Apr 10, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-20321?

How severe is CVE-2018-20321?

Severity scoring for CVE-2018-20321 is pending analysis. The EPSS model estimates a 1.80% probability of exploitation in the next 30 days.

How do I fix CVE-2018-20321?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-20321?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST