CVE-2023-3825: Kepware Kepserverex

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

PTC’s KEPServerEX Versions 6.0 to 6.14.263 are vulnerable to being made to read a recursively defined object that leads to uncontrolled resource consumption. KEPServerEX uses OPC UA, a protocol which defines various object types that can be nested to create complex arrays. It does not implement a check to see if such an object is recursively defined, so an attack could send a maliciously created message that the decoder would try to decode until the stack overflowed and the device crashed.

Affected products

• Kepware Kepserverex: from 6.0.0, up to and including 6.14.263

Published 2023-07-31. Last modified 2026-06-17.