CVE-2023-21839

criticalknown exploitedpublic exploitcovered by 2 sourcesfirst seen 2023-05-01

Actively exploited. CVE-2023-21839 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-05-01) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.

Public exploit code is available. Proof-of-concept or working exploit code for CVE-2023-21839 is indexed in Metasploit, GitHub PoC and Nuclei. Expect opportunistic scanning and exploitation attempts — prioritize remediation.

Multiple vulnerabilities have been discovered in Oracle Weblogic. They allow an attacker to cause remote denial of service, data confidentiality breach and data integrity breach.

CSIRTS triage

What: Multiple vulnerabilities in Oracle Weblogic allow remote denial of service and data confidentiality and integrity breaches.
Who is affected: Oracle Weblogic deployments running affected versions.
Urgency: High priority; vulnerabilities are actively being exploited.
Action: Apply Oracle's security patches for the affected Weblogic versions.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99.9% of all EPSS-scored CVEs.

Exploit availability

Public exploit or proof-of-concept code for CVE-2023-21839 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.

MetasploitA Metasploit Framework module targets this CVE — weaponized, point-and-click exploitation.look it up ↗
GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
NucleiA nuclei-templates detection/PoC template exists for this CVE.look it up ↗

Advisory coverage (2)

unknownexploitedMultiple vulnerabilities in Oracle Weblogic (August 19, 2026)cert-fr-avis · 2026-08-19
criticalexploitedCVE-2023-21839: Oracle WebLogic Server Unspecified Vulnerabilitycisa-kev · 2023-05-01

External references

NVD record for CVE-2023-21839

CVE.org record

CISA KEV catalog

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