What is CVE-2025-40736?

CVE-2025-40736 is a critical-severity vulnerability in Siemens Sinec Nms, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2025-07-08.

How severe is CVE-2025-40736?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Siemens Sinec Nms

CVE-2025-40736

A vulnerability has been identified in SINEC NMS (All versions < V4.0). The affected application exposes an endpoint that allows an unauthorized modification of administrative credentials. This could allow an unauthenticated attacker to reset the superadmin password and gain full control of the application (ZDI-CAN-26569).

Vulnerability class: Broken Authentication

EPSS: 0.004 (33.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Siemens Sinec Nms — versions 0
Siemens Sinec_nms

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

productcert@siemens.com (Vendor Advisory)

Frequently asked questions

What is CVE-2025-40736?: CVE-2025-40736 is a critical-severity vulnerability in Siemens Sinec Nms, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2025-07-08.
How severe is CVE-2025-40736?: Critical severity. CVSS v3 base score is 9.8 out of 10.