Vulnerability record

CVE-2023-21839

Oracle WebLogic Server Unspecified Vulnerability

HighExploitation confirmedCISA KEV

What should I do?

This vulnerability is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it. If you run WebLogic Server, fix it now.

CISA required action: Apply updates per vendor instructions.

US federal civilian agencies must remediate by May 22, 2023.

Patch status

Official fix available since Sep 30, 2026

Apply the vendor's update to every affected system. Check the fixed-in versions below where known.

Basis: NVD patch reference

Patch or advisory on oracle.com (opens in a new tab)

Description

Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 12.2.1.3.0, 12.2.1.4.0 and 14.1.1.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via T3, IIOP to compromise Oracle WebLogic Server. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle WebLogic Server accessible data. CVSS 3.1 Base Score 7.5 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.

Affected products

Products affected by this vulnerability, with versions and the source of each entry
Product	Vendor	Affected versions	Source
WebLogic Server	Oracle	12.2.1.3.0; 12.2.1.4.0; 14.1.1.0.0	KEV

Sources: KEV = CISA Known Exploited Vulnerabilities catalog.

Intelligence timeline

Developments from the last 30 days, newest first.

CVSS scoredUpdateKEVSep 30, 2026
CVE-2023-21839 scored CVSS 7.5: Oracle WebLogic Server, Oracle WebLogic Server Unspecified Vulnerability
CISA lists this as exploited in the wild. Unpatched WebLogic Server systems are exposed to active attacks now.
Basis: NIST National Vulnerability Database
Patch releasedUpdateKEVSep 30, 2026
Patch released for CVE-2023-21839: Oracle WebLogic Server, Oracle WebLogic Server Unspecified Vulnerability
An official fix is now available for Oracle WebLogic Server. This vulnerability is being exploited, so apply it promptly.
Basis: NVD patch reference

1 earlier event is available with a subscription. See plans.

Coverage

We have not published a story about this vulnerability yet.

References

oracle.com https://www.oracle.com/security-alerts/cpujan2023.html
nvd.nist.gov https://nvd.nist.gov/vuln/detail/CVE-2023-21839
packetstormsecurity.com http://packetstormsecurity.com/files/172882/Oracle-Weblogic-PreAuth-Remote-Command-Execution.html
cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-21839