CVE-2021-33721

Name: CVE-2021-33721
Creator: NVD / NIST
Published: 2021-08-10T11:15:09.12+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 2.67%

Last modified Jun 17, 2026

CVE-2021-33721 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). The affected application incorrectly neutralizes special elements when creating batch operations which could lead to command injection. EPSS estimates a 2.67% chance of exploitation in the next 30 days.

Description

A vulnerability has been identified in SINEC NMS (All versions < V1.0 SP2). The affected application incorrectly neutralizes special elements when creating batch operations which could lead to command injection. An authenticated remote attacker with administrative privileges could exploit this vulnerability to execute arbitrary code on the system with system 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

2.67%

83.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Siemens	Sinec Network Management System	< 1.0
Siemens	Sinec Network Management System	1.0

References

https://cert-portal.siemens.com/productcert/pdf/ssa-756744.pdfPatch, Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-756744.pdfPatch, Vendor Advisory

Timeline

Published: Aug 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-33721?

How severe is CVE-2021-33721?

CVE-2021-33721 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 2.67% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33721?

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-2021-33721?

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

Scan your code now

Source: NVD / NIST