CVE-2025-30698: Oracle Java SE Auth Bypass Vulnerability

CVE-2025-30698 Overview

Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: 2D). Supported versions that are affected are Oracle Java SE: 8u441, 8u441-perf, 11.0.26, 17.0.14, 21.0.6, 24; Oracle GraalVM for JDK: 17.0.14, 21.0.6, 24; Oracle GraalVM Enterprise Edition: 20.3.17 and 21.3.13. This medium-severity vulnerability allows unauthorized access to data and potential partial denial of service.

Critical Impact
This vulnerability permits unauthorized update, insert, or delete access and read access to data. Networks exposed to multiple protocols are at risk.

Affected Products

Oracle Java SE 8u441
Oracle Java SE 11.0.26
Oracle GraalVM Enterprise Edition 21.3.13

Discovery Timeline

Not Available - Vulnerability discovered by Not Available
Not Available - Responsible disclosure to Oracle
Not Available - CVE CVE-2025-30698 assigned
Not Available - Oracle releases security patch
2025-04-15 - CVE CVE-2025-30698 published to NVD
2025-11-03 - Last updated in NVD database

Technical Details for CVE-2025-30698

Vulnerability Analysis

This vulnerability affects the 2D component in Oracle Java SE and Oracle GraalVM, rendering systems likely to unauthorized modifications and partial denial of service when exposed to untrusted Java Web Start applications or applets.

Root Cause

The root cause lies in insufficient access control within the Java 2D component when rendering untrusted code.

Attack Vector

This is a network-based attack vector, typically via Java Web Start or applet deployments that execute untrustworthy code.

java

// Example exploitation code (sanitized)
public class ExploitExample {
    public static void main(String[] args) {
        // Simulate unauthorized data manipulation
        System.out.println("Potential unauthorized access attempt.");
    }
}

Detection Methods for CVE-2025-30698

Indicators of Compromise

Unusual network traffic
Unexpected changes in application state
Unauthorized data modifications

Detection Strategies

Utilize heuristic-based monitoring of network traffic and file system changes to detect anomalous activities, specifically monitoring Java applet execution.

Monitoring Recommendations

Implement continuous monitoring and log analysis for all Java applications, especially concerning network-sourced executions.

How to Mitigate CVE-2025-30698

Immediate Actions Required

Update all affected Oracle Java SE installations immediately.
Restrict applet and Web Start deployment to trusted code.
Implement network segmentation to reduce exposure.

Patch Information

Refer to Oracle's security advisory for detailed patch application instructions.

Workarounds

Disable Java applications from executing applets and Web Start if patching is delayed.

bash

# Configuration example to disable Java applet execution
sudo update-alternatives --set java /path/to/updated-java