CVE-2021-3424
Keycloak is vulnerable to IDN homograph attack
5.3
MEDIUM
CVSS 3.1
EPSS 0.16%
Description
A flaw was found in keycloak as shipped in Red Hat Single Sign-On 7.4 where IDN homograph attacks are possible. A malicious user can register himself with a name already registered and trick admin to grant him extra privileges.
How to fix CVE-2021-3424
To remediate CVE-2021-3424, upgrade the affected package to a fixed version below.
- Maven/org.keycloak:keycloak-services—upgrade to 18.0.0 or later
Is CVE-2021-3424 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 18.0.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |