How severe is CVE-2025-40566?

CVE-2025-40566 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-40566 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-40566?

CVE-2025-40566 primarily affects Siemens Simatic Pcs Neo. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-40566?

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-2025-40566 have an EU (EUVD) identifier?

Yes. CVE-2025-40566 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14680.

When was CVE-2025-40566 published?

CVE-2025-40566 was published on 2025-05-13 and last updated on 2026-06-17.

CVE-2025-40566

CVE-2025-40566 is a high-severity vulnerability in Siemens Simatic Pcs Neo with a CVSS 3.x base score of 8.8. 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-613.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 8.7
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-14680
Weakness: CWE-613
Affected product: Siemens Simatic Pcs Neo
Published: 2025-05-13
Last modified: 2026-06-17

Description

A vulnerability has been identified in SIMATIC PCS neo V4.1 (All versions < V4.1 Update 3), SIMATIC PCS neo V5.0 (All versions < V5.0 Update 1). Affected products do not correctly invalidate user sessions upon user logout. This could allow a remote unauthenticated attacker, who has obtained the session token by other means, to re-use a legitimate user's session even after logout.

Frequently asked questions

What is CVE-2025-40566?: A vulnerability has been identified in SIMATIC PCS neo V4.1 (All versions < V4.1 Update 3), SIMATIC PCS neo V5.0 (All versions < V5.0 Update 1). Affected products do not correctly invalidate user sessions upon user logout. This could allow a remote unauthenticated attacker, who has obtained the session token by other means, to re-use a legitimate user's session even after logout.
How severe is CVE-2025-40566?: CVE-2025-40566 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-40566 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-40566?: CVE-2025-40566 primarily affects Siemens Simatic Pcs Neo. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-40566?: 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-2025-40566 have an EU (EUVD) identifier?: Yes. CVE-2025-40566 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14680.
When was CVE-2025-40566 published?: CVE-2025-40566 was published on 2025-05-13 and last updated on 2026-06-17.

References

https://cert-portal.siemens.com/productcert/html/ssa-339086.html

Affected products (5)

cpe:2.3:a:siemens:simatic_pcs_neo:*:*:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_pcs_neo:*:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_pcs_neo:4.1:update_1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_pcs_neo:4.1:update_2:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_pcs_neo:5.0:-:*:*:*:*:*:*

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