---
id: "CVE-2023-21839"
kind: "vulnerability"
aliases: ["CVE-2023-21839"]
title: "Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core)"
severity: "critical"
cvss: 7.5
epss: null
exploited: true
status: "open"
category: "runtime"
products: [{"name": "Oracle WebLogic Server", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "oracle weblogic server", "fixed": [], "affected": "= 12.2.1.3.0", "ecosystem": "vendor"}, {"name": "oracle weblogic server", "fixed": [], "affected": "= 12.2.1.4.0", "ecosystem": "vendor"}, {"name": "oracle weblogic server", "fixed": [], "affected": "= 14.1.1.0.0", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "java", "oracle", "runtime", "self-hosted", "weblogic"]
not_affected_if: ["no-t3-iiop-exposure"]
published_at: "2023-01-18T00:15:13+00:00"
first_seen_at: "2026-10-23T19:11:52+00:00"
updated_at: "2026-10-23T22:29:04+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-21839", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-21839", "first_seen_at": "2026-10-23T22:29:04+00:00"}]
---

# Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core)

Oracle WebLogic Server has an unspecified flaw reachable over the T3 and IIOP protocols. An unauthenticated attacker with network access can compromise the server.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Oracle WebLogic Server affected ? fixed ?
- vendor:oracle weblogic server affected = 12.2.1.3.0 fixed ?
- vendor:oracle weblogic server affected = 12.2.1.4.0 fixed ?
- vendor:oracle weblogic server affected = 14.1.1.0.0 fixed ?

## Fix

Apply the Oracle security updates for WebLogic Server per vendor instructions; the specific patched versions are not in the sources.

## Timeline

- 2026-10-23T19:11:52+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-21839
- 2026-10-23T22:29:04+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2023-21839

## From the sources

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).

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_