SSA-858251 V1.2 (Last Update: 2026-01-13): Authentication Bypass Vulnerabilities in OPC UA

Risk Summary

<p>The products listed below contain two authentication bypass vulnerabilities that could allow an attacker to gain access to the data managed by the server.</p> <p>Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens is preparing further fix versions and recommends countermeasures for products where fixes are not, or not yet available.</p>

Remediations

• Refer to Siemens ProductCERT advisory for patch and remediation guidance.

Affected Vendors

Affected Products (1)