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Oracle WebLogic Server Vulnerability

Released: May 05, 2023

Updated: May 08, 2023

High Severity

Oracle Vendor

Vulnerability Type

Attackers target vulnerable WebLogic servers.

Known exploited vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware. This vulnerability allows an 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 on the Oracle WebLogic Server and the confidentiality impact of the vulnerability is rated as "High". Learn More »

Common Vulnerabilities and Exposures



Oracle WebLogic Server is a unified and extensible platform for developing, deploying and running enterprise applications, such as Java, for on-premises and in the cloud. The affected versions of Oracle WebLogic server include,,

Latest Development

Recent news and incidents related to cybersecurity threats encompassing various events such as data breaches, cyber-attacks, security incidents, and vulnerabilities discovered.

January, 2023: Oracle released a critical patch update advisory https://www.oracle.com/security-alerts/cpujan2023.html

May 1, 2023: CISA added CVE-2023-21839 in CISA's Known Exploited Vulnerabilities Catalog (KEV). May 2, 2023: FortiGuards Labs released a Threat Signal on the vulnerability https://www.fortiguard.com/threat-signal-report/5154 FortiGuard Labs has released an IPS signature to detect and block attack attempts targeting vulnerable Oracle WebLogic Server and also recommends organizations to review and patch affected versions as recommended in the vendor advisory.

FortiGuard Cybersecurity Framework

Mitigate security threats and vulnerabilities by leveraging the range of FortiGuard Services.

  • IPS

  • Assisted Response Services

  • Automated Response

  • InfoSec Services

  • Attack Surface Monitoring (Inside & Outside)

Threat Intelligence

Information gathered from analyzing ongoing cybersecurity events including threat actors, their tactics, techniques, and procedures (TTPs), indicators of compromise (IOCs), malware and related vulnerabilities.

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Indicators of compromise Indicators of compromise
IOC Threat Activity

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Sources of information in support and relation to this Outbreak and vendor.