Weblogic WLS Component IIOP Protocol Remote Code Execution Vulnerability (CVE-2020-2551) Security Alert

Weblogic WLS Component IIOP Protocol Remote Code Execution Vulnerability (CVE-2020-2551) Security Alert

janeiro 29, 2020 | Adeline Zhang


In January 2020, the critical patch update announcement CPU (Critical Patch Update) officially released by Oracle, a remote code execution vulnerability (CVE-2020-2551) in the IIOP protocol of Weblogic WLS component was announced.

The vulnerability can bypass the latest security patches released by Oracle in October 2019. An attacker can remotely access Weblogic Server through the IIOP protocol, passing in malicious data, thereby gaining server privileges and remotely executing arbitrary code without authorization. The official CVSS score is 9.8.

The IIOP protocol accesses remote objects in the form of a Java interface and is enabled by default.

Affected Products and Versions

  • Oracle WebLogic Server
  • Oracle WebLogic Server
  • Oracle WebLogic Server
  • Oracle WebLogic Server


Oracle has released patches. Users can refer to the “Affected Products and Patch Information” section in the official announcement for updates.

Note: The official CPU of Oracle only released the patch of Other versions of the patch will be released on January 31, 2020. Please pay attention to relevant users and install and repair in time after the patch is released.

Mitigation measures

This vulnerability can be mitigated by closing the IIOP protocol. The operation is as follows: In the Weblogic console, select “Services”-> “AdminServer”-> “Protocol” and uncheck the “Enable IIOP” checkbox. And restart the Weblogic project for the configuration to take effect.


Official link:



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