SB2025102757 - Remote denial of service in Keycloak
Published: October 27, 2025 Updated: November 17, 2025
Security Bulletin ID
SB2025102757
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Resource exhaustion (CVE-ID: CVE-2025-11419)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to the default JDK setting that permits Client-Initiated Renegotiation in TLS 1.2. A remote attacker can repeatedly initiate TLS renegotiation requests to exhaust server CPU resources, making the service unavailable.
Remediation
Install update from vendor's website.