# CVE-2023-21839: Oracle WebLogic Server Unspecified Vulnerability

Source: https://junglewise.ai/threats/cve-2023-21839-oracle-weblogic-server-unspecified-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-05-01. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2023-21839 · Severity: critical · CVSS 7.5 · Exploited in the wild · Published 2023-05-01

Oracle WebLogic Server contains a vulnerability in its Core component that allows unauthenticated attackers with network access via T3 or IIOP protocols to compromise the system. Successful exploitation can lead to unauthorized access to critical data or complete access to all data accessible by the server.

Technologies: [Oracle WebLogic Server](https://junglewise.ai/threats/technologies/weblogic-server). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2023-21839 exploited in the wild?** Yes. CVE-2023-21839 is known to be exploited in the wild, first recorded on 1 May 2023. Treat it as urgent.

**How severe is CVE-2023-21839?** Critical severity, with a CVSS score of 7.5, published 1 May 2023.

**Which products and versions are affected?** Oracle WebLogic Server 12.2.1.3.0, 12.2.1.4.0, 14.1.1.0.0.

**Is there a fix for CVE-2023-21839?** A patch was published on 2023-01-17: Oracle Critical Patch Update (CPU) January 2023 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2023-21839 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2023-21839?** Check whether you run Oracle WebLogic Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Oracle WebLogic Server 12.2.1.3.0, 12.2.1.4.0, 14.1.1.0.0

## Timeline

- 2023-01-17: disclosed: NVD Published Date
- 2023-01-17: patched: Oracle Critical Patch Update (CPU) January 2023
- 2023-05-01: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2023-05-01: exploited: Reported as exploited in the wild per CISA KEV entry

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- [Oracle WebLogic Server unauthorized data access in Core](https://junglewise.ai/threats/cve-2026-87302-vulnerability-in-the-oracle-weblogic-server-product-of-oracle)
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- [Oracle WebLogic Server information disclosure in third-party jars](https://junglewise.ai/threats/cve-2026-101515-vulnerability-in-the-oracle-weblogic-server-product-of-oracle)