9.9

CVE-2021-25320: Rancher: Cloud credentials can be used through proxy API by users without access

Modified
AliasesGHSA-gqf8-rvrh-g7w6GO-2026-4589CGA-3j8p-fv87-qmh6
Published 15-07-2021Last modified 16-09-2024

Vulnerability summary

CVE-2021-25320 is a critical (CVSS 9.9) Improper Access Control vulnerability in rancher. EPSS estimates a 0.85% chance of exploitation in the next 30 days, higher than 58.4% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.9 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.9/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.85%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 3
OPENSUSE-SU-2026:21483-1SUSE-SU-2026:1042-1CGA-4F5Q-4HF7-932V

Timeline

  1. 15-07-2021
    PublishedVulnerability first disclosed.
  2. 16-09-2024
    Last modifiedVulnerability information updated.

Description

A Improper Access Control vulnerability in Rancher, allows users in the cluster to make request to cloud providers by creating requests with the cloud-credential ID. Rancher in this case would attach the requested credentials without further checks This issue affects: Rancher versions prior to 2.5.9; Rancher versions prior to 2.4.16.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.85%

Chance of exploitation in the next 30 days

Percentile

58%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.85% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

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)
Github.com/rancher1 product
  • rancher≥ 2.2.0, < 2.4.16 | ≥ 2.5.0, < 2.5.9 | ≥ 2.2.0+incompatible (No fix recorded)
Rancher1 product
  • rancher≥ Rancher, < 2.5.9 | ≥ Rancher, < 2.4.16 | < 2.4.16 | ≥ 2.5.0, < 2.5.9

3 vendors · 6 products

References

4 links