What’s Vulnerable › Vulnerabilities

CVE-2021-3424

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-01 · updated 2026-06-17
• Weakness: CWE-287

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.

Affected products

• Red Hat Single Sign-On: 7.4

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1933320
• https://bugzilla.redhat.com/show_bug.cgi?id=1933320

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