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CVE-2023-21839 — Oracle WebLogic Server Unspecified Vulnerability

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HIGH severity🔴 Actively Exploited · CISA KEV

🔴 CVE-2023-21839 is being actively exploited in the wild. Check if your infrastructure is exposed: ⚡ Free Exposure Scan

Overview

Oracle WebLogic Server contains an unspecified vulnerability that allows an unauthenticated attacker with network access via T3, IIOP, to compromise Oracle WebLogic Server.

Vulnerability details

CVE ID: CVE-2023-21839
Vulnerability: Oracle WebLogic Server Unspecified Vulnerability
Vendor: Oracle
Affected products: Oracle: WebLogic Server
Severity: HIGH
Exploitation status: Actively exploited in the wild (CISA KEV)
Published: 2023-05-01

Remediation guidance

CVE-2023-21839 is in CISA's Known Exploited Vulnerabilities (KEV) catalog — U.S. federal civilian agencies are required to remediate it under Binding Operational Directive 22-01. Treat it as a priority for every environment.

Apply the vendor's official security update for Oracle the affected product as soon as possible. Where a patch is unavailable, apply vendor mitigations or isolate/segment exposed systems.

Hunt for indicators of compromise tied to this vulnerability and confirm logging/EDR coverage on affected assets.

Authoritative references

Remediate CVE-2023-21839 — and stay ahead of the next one

CVE-2023-21839 is listed in the CISA KEV catalog as actively exploited — treat remediation as urgent. Scan your domain free to see whether CVE-2023-21839 and other Oracle issues affect you and get a prioritized remediation report (full report from ₹999) — or stream the full feed of 1,600+ actively-exploited CVEs straight into your SOC.

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