CVE-2025-30698
📋 TL;DR
This vulnerability in Oracle Java SE and GraalVM's 2D component allows an unauthenticated attacker with network access to potentially compromise Java deployments. It primarily affects clients running sandboxed Java Web Start applications or applets that load untrusted code from the internet. Server deployments running only trusted code are not affected.
💻 Affected Systems
- Oracle Java SE
- Oracle GraalVM for JDK
- Oracle GraalVM Enterprise Edition
📦 What is this software?
Graalvm by Oracle
Graalvm by Oracle
Jdk by Oracle
Jdk by Oracle
Jdk by Oracle
Jdk by Oracle
Jdk by Oracle
Jdk by Oracle
Jre by Oracle
Jre by Oracle
Jre by Oracle
Jre by Oracle
Jre by Oracle
Jre by Oracle
⚠️ Risk & Real-World Impact
Worst Case
Successful exploitation could lead to unauthorized data modification, data exfiltration, and partial denial of service in affected Java deployments.
Likely Case
Limited data access and manipulation in sandboxed Java applications, potentially leading to information disclosure or application disruption.
If Mitigated
Minimal impact if deployments only run trusted code or have network restrictions preventing exploitation.
🎯 Exploit Status
Vulnerability is difficult to exploit according to Oracle's assessment. Requires network access and specific conditions to be met.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply patches from Oracle's April 2025 Critical Patch Update
Vendor Advisory: https://www.oracle.com/security-alerts/cpuapr2025.html
Restart Required: Yes
Instructions:
1. Download and install the latest Java updates from Oracle. 2. For Java SE: Update to versions beyond those listed as affected. 3. For GraalVM: Apply patches from Oracle's security updates. 4. Restart affected applications and systems.
🔧 Temporary Workarounds
Disable Java Web Start and Applets
allPrevent execution of untrusted Java code in browser environments
Browser-specific: Disable Java plugin in browser settings
System-wide: Remove or disable Java browser plugins
Network Segmentation
allRestrict network access to Java applications
firewall rules to limit inbound connections to Java services
🧯 If You Can't Patch
- Disable Java Web Start and browser applets entirely
- Implement strict network controls to limit access to Java applications
🔍 How to Verify
Check if Vulnerable:
Check Java version with 'java -version' and compare against affected versions listCheck Version:
java -versionVerify Fix Applied:
Verify Java version is updated beyond affected versions and check patch installation logs📡 Detection & Monitoring
Log Indicators:
- Unusual Java process crashes
- Suspicious network connections to Java applications
- Security manager violation logs
Network Indicators:
- Unexpected network traffic to Java application ports
- Multiple failed connection attempts to Java services
SIEM Query:
source="java.log" AND (event="SecurityException" OR event="AccessControlException")