How severe is CVE-2025-40736?

CVE-2025-40736 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-40736 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-40736?

CVE-2025-40736 affects Siemens Sinec Nms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-40736?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-40736 have an EU (EUVD) identifier?

Yes. CVE-2025-40736 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-20433.

When was CVE-2025-40736 published?

CVE-2025-40736 was published on 2025-07-08 and last updated on 2026-06-17.

CVE-2025-40736

CVE-2025-40736 is a critical-severity vulnerability in Siemens Sinec Nms with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-20433
Weakness: CWE-306
Affected product: Siemens Sinec Nms
Published: 2025-07-08
Last modified: 2026-06-17

Description

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).

Frequently asked questions

What is 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).
How severe is CVE-2025-40736?: CVE-2025-40736 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-40736 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-40736?: CVE-2025-40736 affects Siemens Sinec Nms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-40736?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-40736 have an EU (EUVD) identifier?: Yes. CVE-2025-40736 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-20433.
When was CVE-2025-40736 published?: CVE-2025-40736 was published on 2025-07-08 and last updated on 2026-06-17.

References

https://cert-portal.siemens.com/productcert/html/ssa-078892.html

Affected products (1)

cpe:2.3:a:siemens:sinec_nms:*:*:*:*:*:*:*:*

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