CVE-2025-40566
Siemens SIMATIC PCS neo Session Hijacking Vulnerability
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.
INFO
Published Date :
May 13, 2025, 10:15 a.m.
Last Modified :
Aug. 22, 2025, 8:28 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update SIMATIC PCS neo V4.1 to V4.1 Update 3.
- Update SIMATIC PCS neo V5.0 to V5.0 Update 1.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-40566.
| URL | Resource |
|---|---|
| https://cert-portal.siemens.com/productcert/html/ssa-339086.html | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-40566 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-40566
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-40566 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-40566 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 22, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:siemens:simatic_pcs_neo:*:*:*:*:*:*:*:* versions up to (excluding) 4.1 *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:-:*:*:*:*:*:* *cpe:2.3:a:siemens:simatic_pcs_neo:*:-:*:*:*:*:*:* versions up to (excluding) 5.0 Added Reference Type Siemens AG: https://cert-portal.siemens.com/productcert/html/ssa-339086.html Types: Vendor Advisory -
New CVE Received by [email protected]
May. 13, 2025
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Added CWE CWE-613 Added Reference https://cert-portal.siemens.com/productcert/html/ssa-339086.html