CVE-2023-21839
HighExploitedPublic exploitEasily exploitable vulnerability allows unauthenticated attacker with network access via T3, IIOP to compromise Oracle WebLogic Server.
Published Jan 18, 2023 · Updated Oct 21, 2025
Key Facts
Patch immediately- CVE-2023-21839 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting WebLogic Server (Oracle).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since May 1, 2023. Public exploit code is available.
- EPSS estimates a 100% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS (30-day exploit likelihood)
100%
Higher than 99.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
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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).
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | May 1, 2023 | May 22, 2023 | Not reported |
| Industry KEV feed | May 1, 2023 | May 22, 2023 | Not reported |
| CIRCL KEV | May 1, 2023 | May 22, 2023 | Not reported |
| ENISA EUVD | May 1, 2023 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| WebLogic ServerOracle | 12.2.1.3.0, 12.2.1.4.0, 14.1.1.0.0, >= 12.2.1.3.0 | n/a |
Timeline
Publicly disclosed
Jan 18, 2023
Added to CISA KEV
May 1, 2023
Added to Industry KEV feed
May 1, 2023
Added to CIRCL KEV
May 1, 2023
Added to ENISA EUVD
May 1, 2023
Last updated
Oct 21, 2025
Weakness Type
- CWE-306 Missing Authentication for Critical Function
- CWE-502 Deserialization of Untrusted Data
References
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-21837
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-21838
- advisoryhttps://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-21839
- advisoryOracle Advisory
- advisoryhttps://www.security-database.com/detail.php?alert=CVE-2023-21837
FAQ
Common Questions.
Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core).
Affected: WebLogic Server (Oracle) versions 12.2.1.3.0, 12.2.1.4.0, 14.1.1.0.0, >= 12.2.1.3.0. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since May 1, 2023.
Yes. It was added on May 1, 2023 with a federal remediation due date of May 22, 2023.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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