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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (39.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.000
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)
References
- cert-portal.siemens.com/productcert/html/ssa-339086.html (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.