CVE-2021-33728: Siemens Sinec Nms

High severity, CVSS 7.2. EPSS: 1.6% chance of exploitation in the next 30 days.

A vulnerability has been identified in SINEC NMS (All versions < V1.0 SP2 Update 1). The affected system allows to upload JSON objects that are deserialized to JAVA objects. Due to insecure deserialization of user-supplied content by the affected software, a privileged attacker could exploit this vulnerability by sending a crafted serialized Java object. An exploit could allow the attacker to execute arbitrary code on the device with root privileges.

Affected products

• Siemens Sinec Nms: before 1.0 (fixed in 1.0); version 1.0 only

Published 2021-10-12. Last modified 2026-06-17.