CVE-2013-2465

Java is like a universal “engine” that runs certain apps and web content. This flaw lets attackers use Java in a way that can break the protections Java normally relies on, and it has been seen in ransomware attacks.

Think of it as a weakness in the lock on the Java door—attackers don’t need to break in by normal means when the old version is present.

This matters if your business uses or runs Java Runtime Environment (JRE) on computers or servers that have Java SE 7 (Update 21 and earlier), Java SE 6 (Update 45 and earlier), Java SE 5.0 (Update 45 and earlier), or OpenJDK 7 installed.

Because this issue is in CISA KEV and used in ransomware campaigns, the practical risk is that attackers can target environments where old Java is reachable and present—especially in setups that allow untrusted content or remote access to Java-enabled applications.

This is RED urgent because it is confirmed to be used in ransomware campaigns and is listed in CISA’s Known Exploited Vulnerabilities program.

Act now to remove the vulnerable Java versions from your environment and apply the vendor-fixed updates; waiting increases the chance attackers will target your systems.

Confirm whether you’re exposed

• Inventory every machine (workstations, servers, and build machines) that has Java Runtime Environment (JRE) installed.
• Identify the exact Java variant and update level:
  • Oracle Java SE 7: Update 21 and earlier
  • Java SE 6: Update 45 and earlier
  • Java SE 5.0: Update 45 and earlier
  • OpenJDK 7
• If you use Java indirectly (e.g., packaged apps, legacy web apps, or application servers), confirm the Java runtime version those apps actually use.

Upgrade to the fixed Java update

• Use the vendor security remediation for CVE-2013-2465 (the provided patch/reference is tied to the vendor’s Java remediation for the related Java CPU).
• Apply updates per vendor instructions to reach the fixed level for this issue.

Temporary workaround if patching is delayed

• Reduce exposure by disabling or removing Java where it’s not required.
• Prevent untrusted access paths from reaching Java-enabled features (for example, limit browser/Java plugin usage where applicable and harden any Java-dependent web/app entry points).
• Treat any system still running vulnerable Java as high risk until it is updated.

Verification after change

• Re-check Java versions on each updated system to ensure none remain at the vulnerable update levels listed above.
• Confirm your apps still function with the updated Java.

Timing note from KEV

• CISA added this issue to KEV on 2022-03-28 with a remediation due date of 2022-04-18; bring your environment into compliance as soon as possible.

What to monitor

• Monitor for suspicious activity on systems that previously had vulnerable Java (initial access attempts, unexpected outbound connections, and signs of ransomware behavior).

CVE-2013-2465 is tracked as CWE-693 and is described as an unspecified JRE vulnerability involving 2D functionality, with the potential for attackers to affect confidentiality, integrity, and availability. The public write-up also references claims about bypassing Java sandbox protections via 2D-related verification issues; however, the findings emphasize that the exact vectors are not clearly documented in the available materials.

Exploitation status: This CVE is listed in CISA KEV and is reported as used in ransomware campaigns, which elevates it from “theoretical/predictive” to “actively targeted.”

Exploit code: No public exploit code is noted in the provided findings.

Patch details: The vendor remediation references an Oracle Java CPU security update and an OpenJDK revision (patch link provided via the OpenJDK Mercurial reference). Use the vendor-provided update instructions to reach the fixed level.

EPSS: A very high EPSS prediction is shown in the findings, but because KEV confirms real-world exploitation, the KEV status is the controlling factor for urgency rather than the prediction value.