CVSS 3.1
8.8 highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCVE-2021-31999
High (8.8) in rancher rancher. EPSS 1.1% chance of exploitation in the next 30 days. Fixed in github.com/rancher/rancher 2.4.16, 2.5.9.
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.
Severity
- EPSS
- 1.1% chance of exploitation in the next 30 days; higher than 64% of CVEs (scores of 2026-10-31)
- CWE
- CWE-807
- Published
- Modified
- Record from
- the NVD, synced
Affected
- rancher:rancher
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-pvxj-25m6-7vqr | Go | github.com/rancher/rancher | >=2.0.0 <2.4.16 | 2.4.16 |
| GHSA-pvxj-25m6-7vqr | Go | github.com/rancher/rancher | >=2.5.0 <2.5.9 | 2.5.9 |
| GO-2024-2778 | Go | github.com/rancher/rancher | >=2.0.0+incompatible | no fix published |