ClosedHighPatched

Oracle WebLogic Server: Unspecified (CVE-2023-21839)

Oracle WebLogic Server

Oracle WebLogic Server contains an unspecified vulnerability that allows an unauthenticated attacker with network access via T3, IIOP, to compromise Oracle WebLogic Server. Added to CISA KEV on 2023-05-01.

Why this severity: CVSS 7.5 (NVD), actively exploited (CISA KEV)

Started: May 1, 2023
Closed: May 1, 2023
CVE: CVE-2023-21839

Follow this incident

Updated May 1, 2023

Affected

See vendor advisory / CISA notes (versions not always listed in KEV feed)

Fixed in

See vendor advisory linked in sources

Timeline1

May 1, 2023
CISA added CVE-2023-21839 to the KEV catalog (due 2023-05-22).

Advisories3

Notes & caveats

Derived from CISA KEV JSON feed catalogVersion 2026.10.21. Exact affected/fixed version strings are not always in the KEV record — verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier).

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