CVE-2025-30749
📋 TL;DR
This vulnerability in Oracle Java's 2D component allows an unauthenticated attacker with network access to potentially compromise Java SE, GraalVM for JDK, and GraalVM Enterprise Edition. It primarily affects client deployments 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
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
Complete takeover of the Java runtime environment, allowing arbitrary code execution with the privileges of the Java process.
Likely Case
Remote code execution in client environments running untrusted Java applications from the internet.
If Mitigated
No impact if only trusted code is executed or if Java sandbox is properly configured and isolated.
🎯 Exploit Status
Vulnerability is difficult to exploit according to Oracle's assessment. Requires network access and specific conditions to trigger.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply Critical Patch Update for July 2025 or later
Vendor Advisory: https://www.oracle.com/security-alerts/cpujul2025.html
Restart Required: Yes
Instructions:
1. Download the latest Java updates from Oracle's website
2. Uninstall affected Java versions
3. Install patched versions
4. Restart affected systems
🔧 Temporary Workarounds
Disable Java in browsers
allPrevent Java applets and Web Start applications from running in web browsers
Browser-specific: Disable Java plugin/add-on
Restrict network access
allLimit network access to Java applications to trusted sources only
Use firewall rules to restrict Java application network access
🧯 If You Can't Patch
- Disable Java Web Start and applet execution entirely
- Implement network segmentation to isolate Java applications from untrusted networks
🔍 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 behavior
- Java crash logs
- Security manager violation attempts
Network Indicators:
- Unexpected network connections from Java processes
- Suspicious protocol usage to Java applications
SIEM Query:
source="java.log" AND (event="crash" OR event="security_violation")