What is CVE-2021-33723?

CVE-2021-33723 is a medium-severity vulnerability in Siemens Sinec Nms, classified under Improper Authorization. CVSS score: 6.5/10. Published 2021-10-12.

How severe is CVE-2021-33723?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Siemens Sinec Nms

CVE-2021-33723

A vulnerability has been identified in SINEC NMS (All versions < V1.0 SP2 Update 1). An authenticated attacker could change the user profile of any user without proper authorization. With this, the attacker could change the password of any user in the affected system.

Published 2021-10-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.006 (47.9th percentile), scored 2026-10-05.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Siemens Sinec Nms — versions All versions < V1.0 SP2 Update 1
Siemens Sinec Nms — versions 1.0

Weakness classification (CWE)

CWE-285 — Improper Authorization

References

cert-portal.siemens.com/productcert/pdf/ssa-163251.pdf (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-33723?: CVE-2021-33723 is a medium-severity vulnerability in Siemens Sinec Nms, classified under Improper Authorization. CVSS score: 6.5/10. Published 2021-10-12.
How severe is CVE-2021-33723?: Medium severity. CVSS v3 base score is 6.5 out of 10.