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CVE-2023-21839 Oracle CVE debrief

CVE-2023-21839 is an Oracle WebLogic Server vulnerability that CISA has listed in its Known Exploited Vulnerabilities catalog. The public record supplied here does not provide technical specifics or a CVSS score, but it does require defenders to treat affected WebLogic Server deployments as a priority for remediation and to follow vendor update guidance.

Vendor
Oracle
Product
WebLogic Server
CVSS
HIGH 7.5
CISA KEV
Listed
Original CVE published
2023-05-01
Original CVE updated
2023-05-01
Advisory published
2023-05-01
Advisory updated
2023-05-01

Who should care

Oracle WebLogic Server administrators, application owners, vulnerability management teams, and incident responders responsible for systems that may be exposed or broadly reachable.

Technical summary

The available authoritative data identifies the issue only as an unspecified vulnerability in Oracle WebLogic Server. CISA marked it as known exploited, with a KEV date added of 2023-05-01 and a remediation due date of 2023-05-22. The remediation instruction in the source data is to apply updates per vendor instructions; no further exploit mechanics are provided in the supplied corpus.

Defensive priority

High

Recommended defensive actions

  • Inventory all Oracle WebLogic Server instances and confirm which versions are in use.
  • Apply vendor-recommended updates and patches as directed in Oracle's remediation guidance.
  • Prioritize remediation for internet-facing and business-critical WebLogic deployments.
  • Validate that patched systems are no longer vulnerable and document remediation status.
  • Monitor Oracle and CISA advisories for any follow-up guidance related to this CVE.

Evidence notes

CISA's KEV feed lists this item as 'Oracle WebLogic Server Unspecified Vulnerability' with dateAdded 2023-05-01 and dueDate 2023-05-22, and the required action is 'Apply updates per vendor instructions.' The supplied record also notes links to the Oracle CPU January 2023 advisory and the NVD entry. The provided data does not include CVSS scoring or technical exploit details.

Sources and references

Verified primary and authoritative sources

  • CVE-2023-21839 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2023-21839

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2023-21839 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2023-21839

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.