CVE-2021-33728

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-10-12 · updated 2026-06-17
Weakness: CWE-502

Description

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; 1.0, 1.0-sp1, 1.0-sp2 — fixed in 1.0

How to fix

Upgrade to a fixed version: Siemens SINEC NMS 1.0. Check the vendor advisory for mitigations.

References

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