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Critical severity · published May 13, 2025
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)
9.8
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SP
SIMATIC PCS neo V4.1 · Siemens
before V4.1 Update 3 · source: vendor
SP
SIMATIC PCS neo V5.0 · Siemens
before V5.0 Update 1 · source: vendor
SP
Simatic Pcs Neo · Siemens
before 4.1; before 5.0; 4.1; 4.1; 5.0 · source: NVD
Affected product
SP
SIMATIC PCS neo V4.1
Siemens
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-40566
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-40566
Vendor Advisory
https://cert-portal.siemens.com/productcert/html/ssa-339086.html
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