How severe is CVE-2023-21839?

CVE-2023-21839 has a CVSS 3.1 base score of 7.5 (HIGH). EPSS estimates a 99.9% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2023-21839: Oracle WebLogic Server Unspecified Vulnerability

CISA Known Exploited Vulnerabilities

Oracle WebLogic Server Unspecified Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2023-05-01

Remediation due

2023-05-22

Required action
Apply updates per vendor instructions.

CISA notes
https://www.oracle.com/security-alerts/cpujan2023.html; https://nvd.nist.gov/vuln/detail/CVE-2023-21839

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).

Severity

CVSS 3.1 · CNA7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

SSVC · CISA-ADP

Exploitationactive

Automatableyes

Technical impactpartial

Exploitation Context

as of October 13, 2026

All KEV statistics→

CISA added CVE-2023-21839 to the KEV catalog 104 days after its CVE record was published. The median for entries added in 2023 is 12 days.
It is one of 46 Oracle entries in the CISA KEV catalog, and one of 4 added in 2023.
Its current EPSS score (99.9%) is higher than that of 92% of CISA KEV entries.

Affected Products

Vendor	Product	Affected versions
Oracle Corporation	Oracle Corporation WebLogic Server	12.2.1.3.0 12.2.1.4.0 14.1.1.0.0

References

2 Links

Vendor advisories

Oracle Advisory

Other references

http://packetstormsecurity.com/files/172882/Oracle-Weblogic-PreAuth-Remote-Command-Execution.html

Record Details

Published

2023-01-17

Last updated

2025-10-21

Assigner (CNA)

oracle

Credited to

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CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.