CVE-2025-40566

criticalpriority · track · 39EPSS 0.005 · 40 %ileDEEUNLRUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.46% (40th) EPSS

CVSS 9.8 · critical

Is it mine?

558 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedSIMATIC PCS neo V4.1siemens_psirt
Update to V4.1 Update 3 or later version
https://support.industry.siemens.com/cs/ww/en/view/109978820/
FixedSIMATIC PCS neo V5.0siemens_psirt
Update to V5.0 Update 1 or later version
https://support.industry.siemens.com/cs/ww/en/view/109977244/
FixedSIMATIC PCS neo V4.1cisa_csaf_ot
Update to V4.1 Update 3 or later version
https://support.industry.siemens.com/cs/ww/en/view/109978820/
FixedSIMATIC PCS neo V5.0cisa_csaf_ot
Update to V5.0 Update 1 or later version
https://support.industry.siemens.com/cs/ww/en/view/109977244/

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6.3–9.8

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · CISA US

v3.18.8highAV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · NCSC-NL NL

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · productcert@siemens.com DEexploitability 2.8 · impact 5.9

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · Siemens ProductCERT DE

v4.08.7highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:Nsecondary · ENISA EU

v4.08.7highCVSS: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:Xsecondary · productcert@siemens.com DE

v4.06.3mediumCVSS: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:U/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:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-613USCWE-613USCWE-613USCWE-613USCWE-613US

affected products (558)

Products and version ranges known to be affected.

SIMATIC PCS neo V4.1all versionscisa_csaf_otUS
SIMATIC PCS neo V5.0all versionscisa_csaf_otUS
Siemens SIMATIC PCS neo V4.1< V4.1_Update_3cisa_csaf_otUS
Siemens SIMATIC PCS neo V5.0< V5.0_Update_1cisa_csaf_otUS
Siemens SIMATIC PCS neo V4.10 → V4.1 Update 3enisa_euvdEU
Siemens SIMATIC PCS neo V5.00 → V5.0 Update 1enisa_euvdEU
Siemens AG SIMATIC PCS neo≤ 5.0fstec_bduRU
Siemens AG SIMATIC PCS neo≤ 4.1fstec_bduRU
Siemens INTRALOG WMS≤ vers:siemens/4ncsc_nlNL
Siemens INTRALOG WMS≤ vers:unknown/<v4ncsc_nlNL
Siemens JT2Go (Application)≤ vers:siemens/2312.0005ncsc_nlNL
Siemens RUGGEDCOM APE1808≤ vers:all/*ncsc_nlNL
Siemens RUGGEDCOM APE1808 Firmware≤ vers:unknown/nonencsc_nlNL
Siemens RUGGEDCOM APE1808 Firmware≤ vers:siemens/7.4.5ncsc_nlNL
Siemens RUGGEDCOM CROSSBOW≤ vers:all/<v5.6ncsc_nlNL
Siemens RUGGEDCOM CROSSBOW (Application)≤ vers:unknown/nonencsc_nlNL
Siemens RUGGEDCOM M2100≤ vers:unknown/nonencsc_nlNL
Siemens RUGGEDCOM M2100≤ vers:all/<v4.3.11ncsc_nlNL
Siemens RUGGEDCOM M2100NC≤ vers:unknown/nonencsc_nlNL
Siemens RUGGEDCOM M2200≤ vers:all/<v4.3.11ncsc_nlNL

showing 20 of 558

advisories (3)

Vendor and ecosystem advisories describing this.

NCSC-2025-0160Kwetsbaarheden verholpen in Siemens productenNL2025-05-14csaf · ncsc_nlNL
Siemens heeft kwetsbaarheden verholpen in diverse producten als Apogee, BacNet ATEC, Desigo CC, Intralog, OZW, Polarion, RUGGEDCOM, SICAM, SIMATIC, SIPROTEC, SIRIUS, Teamcenter en Versicharge
SSA-339086SSA-339086: Insufficient Session Expiration Vulnerability in SIMATIC PCS neo2025-05-13csaf · siemens_psirtDE
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. Siemens has released new versions for the affected products and recommends to update to the latest versions.
ICSA-25-135-12Siemens SIMATIC PCS2025-05-13icsa · cisa_csaf_otUS
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. Siemens has released new versions for the affected products and recommends to update to the latest versions.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisa_csaf_ot ncsc_nl siemens_psirt NVD CVE.org MITRE

published 2025-05-13modified 2026-06-17

references (6)

External citations — patches, advisories, analysis.

scry

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