CVE-2025-40566: simatic pcs neo — Fix

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.

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CVSS v3.1 Score

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-613 CWE-613

Affected Products

Vendor	Product	Versions
siemens	simatic_pcs_neo	< 4.1
siemens	simatic_pcs_neo	< 5.0
siemens	simatic_pcs_neo	All
siemens	simatic_pcs_neo	All
siemens	simatic_pcs_neo	All

References

Advisories & Patches

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

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. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2025-40566? +

CVE-2025-40566 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-40566? +

CVE-2025-40566 affects products from siemens, specifically: simatic_pcs_neo. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-40566? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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