Hazard

Is CVE-2023-21839 being exploited?

Weaponised and widely attempted

Reliable public exploit code exists, or mass exploitation attempts are probable. Patch inside days, not weeks.

Oracle WebLogic Server Unspecified Vulnerability

Oracle · WebLogic Server

CVSS 7.5 EPSS 100% no public exploit indexed Fix deadline passed 22 May 2023

What it is

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

Why we say that

  • EPSS puts exploitation in the next 30 days at 100%
  • CISA's federal remediation deadline (2023-05-22) has passed
  • Listed in the CISA Known Exploited Vulnerabilities catalogue

Every line above comes from a named public source. Where the evidence is thin, we say so rather than inventing confidence — see methodology.

What to do

Apply updates per vendor instructions.

What it costs when this goes wrong

This is where UK enforcement meets the vulnerability record. Where an unfixed vulnerability leads to a breach, the ICO treats it as a security failure under UK GDPR. Recent cases:

All UK cases caused by unpatched software →