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CVE-2021-31999 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CNA: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://bugzilla.suse.com/show_bug.cgi?id=1187084	CVE	Issue TrackingRelease NotesThird Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1187084	[email protected]	Issue TrackingRelease NotesThird Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-807	Reliance on Untrusted Inputs in a Security Decision	[email protected]

Affected Products

Product	Versions
rancher rancher	< 2.4.16 >= 2.5.0, < 2.5.9
CPE cpe:2.3:a:rancher:rancher:::::::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Jul 30, 2021	Initial Analysis	[email protected]