How severe is CVE-2026-25656?

CVE-2026-25656 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-25656 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25656?

CVE-2026-25656 primarily affects Siemens Sinec Nms. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-25656?

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

Does CVE-2026-25656 have an EU (EUVD) identifier?

Yes. CVE-2026-25656 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6890.

When was CVE-2026-25656 published?

CVE-2026-25656 was published on 2026-02-10 and last updated on 2026-06-17.

CVE-2026-25656

CVE-2026-25656 is a high-severity vulnerability in Siemens Sinec Nms with a CVSS 3.x base score of 7.8. 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-427.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v4: 8.5
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-6890
Weakness: CWE-427
Affected product: Siemens Sinec Nms
Published: 2026-02-10
Last modified: 2026-06-17

Description

A vulnerability has been identified in SINEC NMS (All versions < V4.0 SP3), User Management Component (UMC) (All versions < V2.15.2.1). The affected application permits improper modification of a configuration file by a low-privileged user. This could allow an attacker to load malicious DLLs, potentially leading to arbitrary code execution with SYSTEM privileges.(ZDI-CAN-28108)

Frequently asked questions

What is CVE-2026-25656?: A vulnerability has been identified in SINEC NMS (All versions < V4.0 SP3), User Management Component (UMC) (All versions < V2.15.2.1). The affected application permits improper modification of a configuration file by a low-privileged user. This could allow an attacker to load malicious DLLs, potentially leading to arbitrary code execution with SYSTEM privileges.(ZDI-CAN-28108)
How severe is CVE-2026-25656?: CVE-2026-25656 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-25656 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25656?: CVE-2026-25656 primarily affects Siemens Sinec Nms. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-25656?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-25656 have an EU (EUVD) identifier?: Yes. CVE-2026-25656 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6890.
When was CVE-2026-25656 published?: CVE-2026-25656 was published on 2026-02-10 and last updated on 2026-06-17.

References

https://cert-portal.siemens.com/productcert/html/ssa-311973.html

Affected products (2)

cpe:2.3:a:siemens:sinec_nms:-:*:*:*:*:*:*:*
cpe:2.3:a:siemens:user_management_component:*:*:*:*:*:*:*:*

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