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CVE-2018-20321

27
FAUCET Score

CVE-2018-20321 is a high-severity vulnerability affecting Rancher versions up to 2.1.5. It allows a project member with access to the default namespace to mount the netes-default service account within a pod, enabling the execution of administrative commands against the Kubernetes cluster. This unauthenticated attack has high impact on confidentiality, integrity, and availability, as reflected by its CVSS score of 8.8. Despite its severity, there is no known active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.0.0, <= 2.1.5CPE matchmatch criteria
cpe:2.3:a:suse:rancher:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.8HIGH

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.80%
Probability of exploitation in next 30 days
EPSS Percentile
76.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0180 is in the 74th percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

gopatch availablevia ghsa
Product: github.com/rancher/rancherFixed in: 2.1.6

Vendor Advisories (1)

goGHSA-9qq2-xhmc-h9qrmedium

Access Control Bypass

Jun 23, 2021

References

forums.rancher.com / c/announcements
Vendor Advisory
rancher.com / blog/2019/2019-01-29-explaining-security-vulnerabilities-addressed-in-rancher-v2-1-6-and-v2-0-11
MitigationVendor Advisory