---
id: "CVE-2020-2551"
kind: "vulnerability"
aliases: ["CVE-2020-2551"]
title: "Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: WLS Core Components)"
severity: "critical"
cvss: 9.8
epss: null
exploited: true
status: "open"
category: "vendor"
products: [{"name": "Oracle Fusion Middleware", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "oracle weblogic server", "fixed": [], "affected": "= 10.3.6.0.0", "ecosystem": "vendor"}, {"name": "oracle weblogic server", "fixed": [], "affected": "= 12.1.3.0.0", "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"}]
ecosystems: ["vendor"]
tags: ["exploited", "java", "oracle-fusion-middleware", "vendor", "weblogic"]
not_affected_if: ["default-config"]
published_at: "2020-01-15T17:15:17+00:00"
first_seen_at: "2026-10-23T19:11:51+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-2020-2551", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-2551", "first_seen_at": "2026-10-23T22:29:04+00:00"}]
---

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

Oracle Fusion Middleware's WebLogic Server WLS Core Components has an unspecified flaw reachable over IIOP. An unauthenticated attacker with network access can compromise the WebLogic Server.

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

## Affected

- vendor:Oracle Fusion Middleware affected ? fixed ?
- vendor:oracle weblogic server affected = 10.3.6.0.0 fixed ?
- vendor:oracle weblogic server affected = 12.1.3.0.0 fixed ?
- vendor:oracle weblogic server affected = 12.2.1.3.0 fixed ?
- vendor:oracle weblogic server affected = 12.2.1.4.0 fixed ?

## Fix

Apply the Oracle patch or mitigation for CVE-2020-2551 per Oracle's advisory, or discontinue use of the product if mitigations are unavailable (CISA required action).

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-2551
- 2026-10-23T22:29:04+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2020-2551

## From the sources

Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: WLS Core Components). Supported versions that are affected are 10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0 and 12.2.1.4.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via IIOP to compromise Oracle WebLogic Server. Successful attacks of this vulnerability can result in takeover of Oracle WebLogic Server. CVSS 3.0 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

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