CVE-2025-40566
published 2025-05-13CVE-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…
PriorityP260critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.37%
29.7th percentile
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.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| siemens | simatic_pcs_neo | < 4.1 | 4.1 |
| siemens | simatic_pcs_neo | < 5.0 | 5.0 |
| siemens | simatic_pcs_neo | — | — |
| siemens | simatic_pcs_neo | — | — |
| siemens | simatic_pcs_neo_v4.1 | < V4.1 Update 3 | V4.1 Update 3 |
| siemens | simatic_pcs_neo_v5.0 | < V5.0 Update 1 | V5.0 Update 1 |
Detection & IOCsextracted from sources · hover to see the quote
- →Monitor for reuse of session tokens after a user logout event on SIMATIC PCS neo — a valid session token being presented post-logout indicates exploitation of insufficient session expiration (CWE-613). ↗
- →Flag remote, unauthenticated network connections to SIMATIC PCS neo that present a session token without a preceding authentication event, particularly following a logout action by the legitimate user. ↗
- ·Vulnerability is exploitable only if an attacker has already obtained a valid session token through other means (e.g., network interception, credential theft); the CVE itself does not describe the token-theft vector. ↗
- ·No known public exploitation specifically targeting this vulnerability has been reported at the time of advisory publication. ↗
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv4.08.7HIGHCVSS:4.0/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
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CISA ICS
Siemens SIMATIC PCS neo
cisa_ics·2025-05-15·CVSS 8.8
[HIGH] Siemens SIMATIC PCS neo
ICS Advisory
##
Siemens SIMATIC PCS neo
Release DateMay 15, 2025
Alert CodeICSA-25-135-12
Related topics:
Industrial Control System Vulnerabilities, Industrial Control Systems
As of January 10, 2023, CISA will no longer be updating ICS security advisories for Siemens product vulnerabilities beyond the initial advisory. For the most up-to-date information on vulnerabilities in this advisory, please see Siemens' ProductCERT Security Advisories (CERT Services | Services | Siemens Global).
View CSAF
## 1. EXECUTIVE SUMMARY
- CVSS v4 8.7
- ATTENTION: Exploitable remotely/low attack complexity
- Vendor: Siemens
- Equipment: SIMATIC PCS neo
- Vulnerability: Insufficient Session Expiration
## 2. RISK EVALUATION
Successful exploitation of this vulnerability cou
GHSA
GHSA-wmm5-59wm-x34p: A vulnerability has been identified in SIMATIC PCS neo V4
ghsa_unreviewed·2025-05-13
CVE-2025-40566 [HIGH] CWE-613 GHSA-wmm5-59wm-x34p: A vulnerability has been identified in SIMATIC PCS neo V4
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.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2025-05-13
Published