CVE-2021-33728

Name: CVE-2021-33728
Creator: NVD / NIST
Published: 2021-10-12T10:15:12.01+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 1.50%

Last modified Jun 17, 2026

CVE-2021-33728 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. 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. EPSS estimates a 1.50% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.2/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.50%

71.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-502

Affected Software

Vendor	Product	Versions
Siemens	Sinec Nms	< 1.0
Siemens	Sinec Nms	1.0

References

https://cert-portal.siemens.com/productcert/pdf/ssa-163251.pdfPatch, Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-163251.pdfPatch, Vendor Advisory

Timeline

Published: Oct 12, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-33728?

How severe is CVE-2021-33728?

CVE-2021-33728 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 1.50% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33728?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-33728?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST