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CVE-2025-2559

4.9 · MEDIUM

A flaw was found in Keycloak.

Published Mar 25, 2025CWE-770EPSS 0.69%

Overview

CVE-2025-2559 is a medium-severity vulnerability. It was published on March 25, 2025 and has a CVSS 3.1 base score of 4.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.9, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

A flaw was found in Keycloak. When the configuration uses JWT tokens for authentication, the tokens are cached until expiration. If a client uses JWT tokens with an excessively long expiration time, for example, 24 or 48 hours, the cache can grow indefinitely, leading to an OutOfMemoryError. This issue could result in a denial of service condition, preventing legitimate users from accessing the system.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaccess.redhat.com/errata/RHSA-2025:4335Refaccess.redhat.com/errata/RHSA-2025:4336Refaccess.redhat.com/security/cve/CVE-2025-2559Refbugzilla.redhat.com/show_bug.cgi?id=2353868GitHubgithub.com/keycloak/keycloak/commit/a10c8119d4452b866b90a9019b2cc159919276caGitHubgithub.com/keycloak/keycloak/issues/38576

How CyberStrike helps

Frequently asked questions

What is CVE-2025-2559?

CVE-2025-2559 is a medium-severity vulnerability. It was published on March 25, 2025 and has a CVSS 3.1 base score of 4.9 (MEDIUM).

How severe is CVE-2025-2559?

This vulnerability has a CVSS 3.1 base score of 4.9, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-2559?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-2559?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-2559 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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