CVE-2021-20202

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-05-12 · updated 2026-06-17
Weakness: CWE-377

Description

A flaw was found in keycloak. Directories can be created prior to the Java process creating them in the temporary directory, but with wider user permissions, allowing the attacker to have access to the contents that keycloak stores in this directory. The highest threat from this vulnerability is to data confidentiality and integrity.

Affected products

Keycloak: before 13.0.0 — fixed in 13.0.0

How to fix

Upgrade to a fixed version: Keycloak 13.0.0. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1922128
https://bugzilla.redhat.com/show_bug.cgi?id=1922128

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