CVE-2022-39399

What it actually does

The vulnerability permits an unauthenticated remote attacker to perform unauthorized modifications (insert, update, or delete) to certain accessible data through a difficult-to-exploit condition in the Networking component when processing untrusted code in a sandboxed Java environment over HTTP.

Why it matters to the business

May allow limited tampering with data in client-side Java applications that execute untrusted code from the internet, potentially affecting integrity of application data without broader system compromise; widespread downstream use in enterprise tools increases exposure across many organizations.

How an attack unfolds

An attacker delivers malicious content via HTTP to a vulnerable Java client running sandboxed untrusted code, exploiting the networking flaw to bypass sandbox restrictions and modify accessible data.

How to fix it

Update affected Oracle Java SE and GraalVM installations to the latest patched versions released by Oracle. Disable Java Web Start and applets if not required. Apply security updates to downstream affected products such as Fedora and NetApp components.

How to confirm the fix worked

Verify Java runtime versions are updated beyond the affected releases. Test sandboxed applications to confirm no unauthorized data changes occur under simulated attack conditions.

Typical attack path

1. Identify target running vulnerable Java client with sandboxed untrusted code
2. Craft malicious HTTP payload targeting the networking component
3. Deliver payload to trigger the flaw
4. Achieve unauthorized data modification

How to detect it

Monitor application and network logs for unusual HTTP interactions involving Java networking components in client environments. Look for unexpected data modifications in applications using sandboxed Java code.

What your security team should do

• Prioritize updating Java environments that handle untrusted code from the internet
• Review and restrict usage of Java applets and Web Start applications
• Apply vendor patches to Oracle Java and all downstream products promptly