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Vulnerability record · CVE-2024-20931 · published 17 February 2024

CVE-2024-20931: Oracle WebLogic Server Core improper access control via T3/IIOP

Oracle · Weblogic Server

Oracle WebLogic Server (Core component) contains an improper access control flaw in supported versions 12.2.1.4.0 and 14.1.1.0.0. An unauthenticated attacker with network access can reach the server over T3 or IIOP and gain unauthorized access to critical data. The CVSS 3.1 base score is 7.5, reflecting a high confidentiality impact with no integrity or availability impact.

7.5 CVSS 3.1 High EPSS 59% · top 0.9% CWE-284 · Improper access control
7.5CVSS 3.1 base score
59%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 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).

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

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 19 September 2026. Confidence: medium.

high priorityUnauthenticated network-reachable data disclosure with a high EPSS percentile warrants prompt patching and exposure reduction.

What it is

Oracle WebLogic Server (Core component) contains an improper access control flaw in supported versions 12.2.1.4.0 and 14.1.1.0.0. An unauthenticated attacker with network access can reach the server over T3 or IIOP and gain unauthorized access to critical data. The CVSS 3.1 base score is 7.5, reflecting a high confidentiality impact with no integrity or availability impact.

Impact

An attacker can read critical data or gain complete access to all data reachable through the affected WebLogic Server. There is no integrity or availability impact per the CVSS vector.

Attack surface

Reachable over the network via the T3 and IIOP protocols; no authentication and no user interaction are required per the CVSS vector (AV:N/AC:L/PR:N/UI:N).

Exploitation

Not listed in CISA KEV and no public exploit references are provided; EPSS 30-day probability is 0.59412 (99.077th percentile), indicating a high likelihood of attempted exploitation.

What to do

  • Apply the Oracle Critical Patch Update (January 2024) fixes for WebLogic Server 12.2.1.4.0 and 14.1.1.0.0.
  • Restrict network access to T3 and IIOP ports to trusted hosts only.
  • Disable or filter T3/IIOP where not required by applications.
  • Monitor Oracle advisories for updated guidance and any revised affected versions.

Detection

  • Monitor for unexpected T3 or IIOP connections to WebLogic Server from untrusted sources.
  • Alert on anomalous data access or serialization activity in WebLogic Server logs.
  • Track authentication-free T3/IIOP requests that deviate from normal application traffic baselines.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.oracle.com/security-alerts/cpujan2024.html Vendor Advisory
https://www.oracle.com/security-alerts/cpujan2024.html Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2024-20931), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.