Rapid7’s 2026 Global Cybersecurity Summit is now available on-demand.Watch sessions.
Rapid7

module

WebLogic Server Deserialization RCE BadAttributeValueExpException ExtComp

Disclosed
Apr 30, 2020
Created
Jun 4, 2020

Description

There exists a Java object deserialization vulnerability
in multiple versions of WebLogic.

Unauthenticated remote code execution can be achieved by
sending a serialized `BadAttributeValueExpException`
object over the T3 protocol to vulnerable versions of
WebLogic. Leveraging an `ExtractorComparator` enables
the ability to trigger `method.invoke()`, which will
execute arbitrary code.

Authors

Quynh Le
Y4er
Shelby Pace
Steve Embling

Platform

Linux,Unix,Windows

Architectures

x86, x64

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':


msf > use exploit/multi/misc/weblogic_deserialize_badattr_extcomp
msf exploit(weblogic_deserialize_badattr_extcomp) > show targets
...targets...
msf exploit(weblogic_deserialize_badattr_extcomp) > set TARGET < target-id >
msf exploit(weblogic_deserialize_badattr_extcomp) > show options
...show and set options...
msf exploit(weblogic_deserialize_badattr_extcomp) > exploit

Title
Rapid7 Labs

2026 Global Threat Landscape Report

The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.