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HIGH · CVSS 7.5 CISA Known Exploited Vulnerability

CVE-2023-21839

Oracle WebLogic Server Unspecified Vulnerability

Oracle WebLogic Server

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).

CVSS
7.5
HIGH
EPSS
99.9%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
18 Jan 2023
CWE-502, CWE-306

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 1 May 2023. US federal agencies were required to remediate it by 22 May 2023.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 99.9%, which is higher than 99.9% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

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

Frequently asked questions

Is CVE-2023-21839 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2023-21839.

What does CVE-2023-21839 affect?

CVE-2023-21839 affects Oracle WebLogic Server. 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).

How severe is CVE-2023-21839?

CVE-2023-21839 is rated HIGH with a CVSS base score of 7.5. EPSS puts the probability of exploitation in the next 30 days at 99.9%, higher than 99.9% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 22 May 2023.

How should organisations respond to CVE-2023-21839?

Apply the vendor patch for Oracle WebLogic Server as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.