Is CVE-2021-31999 in the CISA KEV catalog?

No. CVE-2021-31999 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-31999?

CVE-2021-31999 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-31999?

CVE-2021-31999 has an EPSS score of 1.05% (60th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-31999?

Upgrade rancher to 2.5.9 or later.

CVE & CISA-KEV Catalog

CVE-2021-31999

HIGH

8.8

CVSS v3

NVD

Description

A Reliance on Untrusted Inputs in a Security Decision vulnerability in Rancher allows users in the cluster to act as others users in the cluster by forging the "Impersonate-User" or "Impersonate-Group" headers. This issue affects: Rancher versions prior to 2.5.9. Rancher versions prior to 2.4.16.

CWE-807

How to fix

Remediation Available

rancherNVD

Affected:>= 2.5.0, < 2.5.9Fixed in:2.5.9CVE-2021-31999derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.05%probability of exploitation in 30 days

60thpercentile

Moderate risk: more likely to be exploited than 60% of all known CVEs.

References

Third-Party Advisory1

bugzilla.suse.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.