6.5

CVE-2020-27838: redhat keycloak Improper Authentication

CVSS: 6.5v3.1MediumModified
AliasesGHSA-pcv5-m2wh-66j3
Published 08-03-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-27838 is a medium (CVSS 6.5) Improper Authentication vulnerability in redhat keycloak. EPSS estimates a 17.94% chance of exploitation in the next 30 days, higher than 97.1% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (NVD)
EPSS score
17.94%
0%100%
Medium · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 08-03-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

A flaw was found in keycloak in versions prior to 13.0.0. The client registration endpoint allows fetching information about PUBLIC clients (like client secret) without authentication which could be an issue if the same PUBLIC client changed to CONFIDENTIAL later. The highest threat from this vulnerability is to data confidentiality.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

17.94%

Chance of exploitation in the next 30 days

Percentile

97%

Versus all other CVEs

30-day change

0.00 pp

From 17.94% on 21-09-2026

21-09-202621-10-2026
EPSS score
17.94%

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

Redhat2 products
Org.keycloak1 product
  • keycloak-core< 13.0.0

2 vendors · 3 products

References

4 links