CRITICAL · CVSS 9.8 CISA Known Exploited Vulnerability

CVE-2020-2551

Oracle Fusion Middleware Unspecified Vulnerability

Oracle Fusion Middleware

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).

CVSS

9.8

CRITICAL

EPSS

93.2%

30-day exploitation

Ransomware groups

recorded exploiting

Published

15 Jan 2020

NVD

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 16 November 2023. US federal agencies were required to remediate it by 7 December 2023.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 93.2%, which is higher than 99.8% 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:H/A:H

Frequently asked questions

Is CVE-2020-2551 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2020-2551.

What does CVE-2020-2551 affect?

CVE-2020-2551 affects Oracle Fusion Middleware. 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).

How severe is CVE-2020-2551?

CVE-2020-2551 is rated CRITICAL with a CVSS base score of 9.8. EPSS puts the probability of exploitation in the next 30 days at 93.2%, higher than 99.8% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 7 December 2023.

How should organisations respond to CVE-2020-2551?

Apply the vendor patch for Oracle Fusion Middleware 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.