CVE-2020-2883

CVE-2020-2883 is an easily exploitable, unauthenticated vulnerability in the Core component of Oracle WebLogic Server that is reachable over the network via the T3 and IIOP protocols. An attacker with network access to a WebLogic listener can trigger the flaw without credentials or user interaction, and successful exploitation results in takeover of Oracle WebLogic Server, with high confidentiality, integrity, and availability impact. The supported affected releases are 10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0 and 12.2.1.4.0. Oracle rates the flaw CVSS 9.8 (Critical), and it carries a very high EPSS of 94.9% (100th percentile), indicating near-certain near-term exploitation likelihood. CISA added it to the Known Exploited Vulnerabilities catalog on 2025-01-07 amid active exploitation, with reports of hackers targeting WebLogic servers and the flaw included in Oracle's January 2025 patch cycle.

What to do: Apply the Oracle Critical Patch Update fixes for WebLogic Server — Oracle's January 2025 patch release includes WebLogic fixes, and the affected releases (10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0, 12.2.1.4.0) must be patched per vendor instructions. Until patched, restrict network access to the T3 and IIOP listeners (e.g., firewall them to trusted hosts only), prioritize internet-facing instances, and hunt for signs of exploitation. Per CISA KEV guidance, apply vendor mitigations or discontinue use of the product if mitigations are unavailable.