Insufficient session expiration in Siemens SIMATIC PCS neo V4.1
Priority MEDIUM 40CWE-613Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-613.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00458 39th percentileScored 2026-11-07
Fix Fixed SIMATIC PCS neo V4.1 (Siemens): V4.1 Update 3SIMATIC PCS neo V5.0 (Siemens): V5.0 Update 1
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Siemens | SIMATIC PCS neo V4.1 | before V4.1 Update 3 | V4.1 Update 3 | Patch available | CNA |
| Siemens | SIMATIC PCS neo V5.0 | before V5.0 Update 1 | V5.0 Update 1 | Patch available | CNA |
- SIMATIC PCS neo V4.1 VendorSiemens Affected before V4.1 Update 3 Fixed in V4.1 Update 3 Patch available CNA
- SIMATIC PCS neo V5.0 VendorSiemens Affected before V5.0 Update 1 Fixed in V5.0 Update 1 Patch available CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:siemens:simatic_pcs_neo:*:*:*:*:*:*:*:* | before 4.1 | Vulnerable | Siemens |
| cpe:2.3:a:siemens:simatic_pcs_neo:*:-:*:*:*:*:*:* | before 5.0 | Vulnerable | Siemens |
| cpe:2.3:a:siemens:simatic_pcs_neo:4.1:update_1:*:*:*:*:*:* | 4.1 update_1 | Vulnerable | Siemens |
| cpe:2.3:a:siemens:simatic_pcs_neo:4.1:update_2:*:*:*:*:*:* | 4.1 update_2 | Vulnerable | Siemens |
| cpe:2.3:a:siemens:simatic_pcs_neo:5.0:-:*:*:*:*:*:* | 5.0 | Vulnerable | Siemens |
- cpe:2.3:a:siemens:simatic_pcs_neo:*:*:*:*:*:*:*:* Versions before 4.1 Vulnerable ·Siemens
- cpe:2.3:a:siemens:simatic_pcs_neo:*:-:*:*:*:*:*:* Versions before 5.0 Vulnerable ·Siemens
- cpe:2.3:a:siemens:simatic_pcs_neo:4.1:update_1:*:*:*:*:*:* Versions 4.1 update_1 Vulnerable ·Siemens
- cpe:2.3:a:siemens:simatic_pcs_neo:4.1:update_2:*:*:*:*:*:* Versions 4.1 update_2 Vulnerable ·Siemens
- cpe:2.3:a:siemens:simatic_pcs_neo:5.0:-:*:*:*:*:*:* Versions 5.0 Vulnerable ·Siemens
Remediation
- Fix · CNA SIMATIC PCS neo V4.1 (Siemens) Fixed in V4.1 Update 3
- Fix · CNA SIMATIC PCS neo V5.0 (Siemens) Fixed in V5.0 Update 1
Timeline
- 2026-10-02 Threatist record created from CVE-2025-40566
- 2026-10-03 Alias added: GHSA-wmm5-59wm-x34p
References
More Siemens Simatic Pcs Neo vulnerabilities
- TI-2021-03396 Out-of-bounds read in Wibu-Systems CodeMeter CVSS 3.1CRITICAL 9.1
- TI-2025-21515 Out-of-bounds read in Siemens SIMATIC PCS neo V4.1 CVSS 4.0HIGH 8.7
- TI-2025-21514 Out-of-bounds write in Siemens SIMATIC PCS neo V4.1 CVSS 4.0HIGH 8.7
- TI-2023-24750 SQL injection in Siemens SIMATIC PCS neo CVSS 3.1HIGH 8.0
- TI-2023-24902 A vulnerability has been identified in Opcenter Execution Foundation (All versions <… CVSS 3.1HIGH 8.8
- TI-2025-27243 Stack-based buffer overflow in Siemens SIMATIC PCS neo V4.1 CVSS 4.0CRITICAL 9.3
Sources
- CVE-2025-40566 · CVE Program
- CVE-2025-40566 · NVD
- FIRST EPSS
- GHSA-wmm5-59wm-x34p · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences