8.8

CVE-2021-31999: rancher

CVSS: 8.8v3.1HighModified
AliasesGHSA-pvxj-25m6-7vqrGO-2024-2778CGA-4crm-3cvp-w6cr
Published 15-07-2021Last modified 17-09-2024
Open JSON

Vulnerability summary

CVE-2021-31999 is a high (CVSS 8.8) vulnerability in rancher. EPSS estimates a 1.05% chance of exploitation in the next 30 days, higher than 63.7% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
1.05%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-9Q35-52XF-4R6G

Timeline

  1. 15-07-2021
    PublishedVulnerability first disclosed.
  2. 17-09-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

6 scores · 4 sources · 3 versions

EPSS trend

Probability

1.05%

Chance of exploitation in the next 30 days

Percentile

64%

Versus all other CVEs

30-day change

0.00 pp

From 1.05% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.05%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard4 products
  • harvesterAll versions (No fix recorded)
  • harvester-fipsAll versions (No fix recorded)
  • harvester-fips-webhookAll versions (No fix recorded)
  • harvester-webhookAll versions (No fix recorded)
Rancher2 products
Github.com/rancher1 product
  • rancher≥ 2.0.0, < 2.4.16 | ≥ 2.5.0, < 2.5.9 | ≥ 2.0.0+incompatible (No fix recorded)

3 vendors · 7 products

References

5 links