Oracle WebLogic Server Unauthenticated Remote Takeover via T3/IIOP
Actively exploited in the wild. Patch or mitigate immediately — don't wait for a maintenance window.
An unauthenticated attacker, remotely over the network, with no user interaction, can fully compromise the system — steal data, tamper with it and take it offline.
Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0 and 12.2.1.4.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via IIOP, T3 to compromise Oracle WebLogic Server. Successful attacks of this vulnerability can result in takeover of Oracle WebLogic Server. CVSS 3.0 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
Inferred from the weakness type (CWE) and how the flaw is reached — the techniques an attacker would chain to exploit this. Real-world corroboration appears here as threat intel is folded in.
Corroborated threat activity referencing this CVE — with source and confidence, not inference.
Named threat actors and observed ATT&CK techniques appear here as intel feeds are folded in — the ATT&CK chain above stays inferred until then.
Generated by Wavense from the CVE record — an immediate mitigation and the permanent fix.
To immediately reduce risk, restrict network access to WebLogic Server ports, especially those used by T3 and IIOP protocols, through network firewalls or security groups. Implement network segmentation to isolate WebLogic servers from untrusted networks and enable robust logging and monitoring for suspicious traffic patterns related to these protocols. Consider temporarily disabling T3/IIOP if not essential for critical operations, though this may impact functionality.
The permanent resolution is to apply the latest Oracle Critical Patch Update (CPU) that specifically addresses CVE-2020-2883 for your affected WebLogic Server versions. Ensure all instances of versions 10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0, and 12.2.1.4.0 are patched promptly. Refer to the official Oracle Security Advisories for precise patch information and installation instructions relevant to your specific environment and version.
An unauthenticated attacker can exploit this vulnerability with network access via T3 or IIOP protocols to completely compromise the Oracle WebLogic Server. This allows for full control over the affected server, leading to severe impacts on confidentiality, integrity, and availability of hosted applications and data. The business consequences include potential data breaches, unauthorized system modifications, and complete disruption of critical services.
No CWE classification has been assigned.
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