How severe is CVE-2025-40795?

CVE-2025-40795 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-2025-40795 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-40795?

CVE-2025-40795 primarily affects Siemens Simatic Pcs Neo. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-40795?

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-2025-40795 have an EU (EUVD) identifier?

Yes. CVE-2025-40795 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27240.

When was CVE-2025-40795 published?

CVE-2025-40795 was published on 2025-09-09 and last updated on 2026-06-17.

CVE-2025-40795

CVE-2025-40795 is a critical-severity vulnerability in Siemens Simatic Pcs Neo 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-121.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-27240
Weakness: CWE-121
Affected product: Siemens Simatic Pcs Neo
Published: 2025-09-09
Last modified: 2026-06-17

Description

A vulnerability has been identified in SIMATIC PCS neo V4.1 (All versions), SIMATIC PCS neo V5.0 (All versions), SIMATIC PCS neo V6.0 (All versions < V6.0 SP1 Update 1), User Management Component (UMC) (All versions < V2.15.1.3). Affected products contain a stack-based buffer overflow vulnerability in the integrated UMC component. This could allow an unauthenticated remote attacker to execute arbitrary code or to cause a denial of service condition.

Frequently asked questions

What is CVE-2025-40795?: A vulnerability has been identified in SIMATIC PCS neo V4.1 (All versions), SIMATIC PCS neo V5.0 (All versions), SIMATIC PCS neo V6.0 (All versions < V6.0 SP1 Update 1), User Management Component (UMC) (All versions < V2.15.1.3). Affected products contain a stack-based buffer overflow vulnerability in the integrated UMC component. This could allow an unauthenticated remote attacker to execute arbitrary code or to cause a denial of service condition.
How severe is CVE-2025-40795?: CVE-2025-40795 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-2025-40795 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-40795?: CVE-2025-40795 primarily affects Siemens Simatic Pcs Neo. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-40795?: 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-2025-40795 have an EU (EUVD) identifier?: Yes. CVE-2025-40795 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27240.
When was CVE-2025-40795 published?: CVE-2025-40795 was published on 2025-09-09 and last updated on 2026-06-17.

References

https://cert-portal.siemens.com/productcert/html/ssa-722410.html

Affected products (3)

cpe:2.3:a:siemens:simatic_pcs_neo:4.1:*:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_pcs_neo:5.0:*:*:*:*:*:*:*
cpe:2.3:a:siemens:user_management_component:*:*:*:*:*:*:*:*

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