SSA-321292 V1.5 (Last Update: 2023-04-11): Denial of Service in the OPC Foundation Local Discovery Server (LDS) in Industrial Products


The vulnerability classification has been performed by using the CVSS scoring system in version 3.1 (CVSS v3.1) ( The CVSS environmental score is specific to the customer’s environment and will impact the overall CVSS score. The environmental score should therefore be individually defined by the customer to accomplish final scoring.

An additional classification has been performed using the CWE classification, a community-developed list of common software security weaknesses. This serves as a common language and as a baseline for weakness identification, mitigation, and prevention efforts. A detailed list of CWE classes can be found at:

Vulnerability CVE-2021-40142 In OPC Foundation Local Discovery Server (LDS) before 1.04.402.463, remote attackers can cause a denial of service condition by sending carefully crafted messages that lead to access of a memory location after the end of a buffer. CVSS v3.1 Base Score 7.5 CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C CWE CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

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