What is CVE-2025-40566?

CVE-2025-40566 is a high-severity vulnerability in Siemens Simatic Pcs Neo, classified under Insufficient Session Expiration. CVSS score: 8.8/10. Published 2025-05-13.

How severe is CVE-2025-40566?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Siemens Simatic Pcs Neo

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.

EPSS: 0.004 (37.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Siemens Simatic_pcs_neo — versions 4.1, 5.0
Siemens Simatic Pcs Neo V4.1 — versions 0
Siemens Simatic Pcs Neo V5.0 — versions 0

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

productcert@siemens.com (Vendor Advisory)

Frequently asked questions

What is CVE-2025-40566?: CVE-2025-40566 is a high-severity vulnerability in Siemens Simatic Pcs Neo, classified under Insufficient Session Expiration. CVSS score: 8.8/10. Published 2025-05-13.
How severe is CVE-2025-40566?: High severity. CVSS v3 base score is 8.8 out of 10.