CVE intelligence and bounded remediation

CVE-2023-32787 — Opcfoundation Ua Java Legacy security vulnerability

High CVSS 7.5

The OPC UA Legacy Java Stack before 6f176f2 enables an attacker to block OPC UA server applications via uncontrolled resource consumption so that they can no longer serve client applications.

Severity
High
CVSS
7.5 (3.1)
Published
2023-05-15
CISA KEV
Not currently listed
Ecosystem
java/maven
Weaknesses
CWE-400

Affected products

  • opcfoundation / ua_java_legacy
  • prosysopc / ua_historian
  • prosysopc / ua_modbus_server
  • prosysopc / ua_simulation_server

Matched remediation archetype

Resource exhaustion and denial of service

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Identify attacker-influenced work factors including input size, nesting, compression, fan-out, regex cost, allocation, recursion, retries, and connection lifetime.
  • Map per-request and shared CPU, memory, disk, descriptor, thread, queue, and downstream-service limits.
  • Determine whether authentication, tenancy, quotas, and rate controls apply before expensive processing begins.

Remediate safely

  • Bound input size, nesting, expansion, work, concurrency, queue depth, retries, and execution time before resource-intensive processing.
  • Release resources on every success, error, cancellation, and timeout path and use backpressure instead of unbounded buffering.
  • Update affected components and add small deterministic tests that assert resource ceilings rather than exhausting a host.

Authoritative sources

Complete CVE record and remediation plan

The detailed catalog view below loads this exact record, its source evidence, and the full seven-phase agentic change plan.