CVE-2025-40798

highpriority · track · 0EPSS 0.005 · 45 %ileDEEUNLRUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.54% (45th) EPSS
CVSS 7.5 · high
Is it mine?
34 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), SIMATIC PCS neo V5.0 (All versions), SIMATIC PCS neo V6.0 (All versions < V6.0 SP1 Update 1), User Management Component (UMC) (All versions < V2.15.1.3). Affected products contain a out-of-bounds read vulnerability in the integrated UMC component. This could allow an unauthenticated remote attacker to cause a denial of service condition.

01

remediations

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

A vendor fix is available.

  • FixedSIMATIC PCS neo V6.0siemens_psirt

    Update to V6.0 SP1 Update 1 or later version

    https://support.industry.siemens.com/cs/ww/en/view/110000357/
  • FixedUser Management Component (UMC)siemens_psirt

    Update to V2.15.1.3 or later version

    https://support.industry.siemens.com/cs/ww/en/view/109991261/
  • FixedSIMATIC PCS neo V6.0cisa_csaf_ot

    Update to V6.0 SP1 Update 1 or later version

    https://support.industry.siemens.com/cs/ww/en/view/110000357/
  • FixedUser Management Component (UMC)cisa_csaf_ot

    Update to V2.15.1.3 or later version

    https://support.industry.siemens.com/cs/ww/en/view/109991261/
  • MitigationSIMATIC PCS neo V4.1siemens_psirt

    In non-networked scenarios/deployments block TCP ports 4002 and 4004 on machines with UMC installed. If the deployment is not using the 'RT Server' type of UMC machine, port 4004 can be blocked everywhere without impacting network functionality for all other UMC machine-types (Server, Ring-Server, Agent).

  • MitigationSIMATIC PCS neo V5.0siemens_psirt

    In non-networked scenarios/deployments block TCP ports 4002 and 4004 on machines with UMC installed. If the deployment is not using the 'RT Server' type of UMC machine, port 4004 can be blocked everywhere without impacting network functionality for all other UMC machine-types (Server, Ring-Server, Agent).

  • MitigationSIMATIC PCS neo V6.0siemens_psirt

    In non-networked scenarios/deployments block TCP ports 4002 and 4004 on machines with UMC installed. If the deployment is not using the 'RT Server' type of UMC machine, port 4004 can be blocked everywhere without impacting network functionality for all other UMC machine-types (Server, Ring-Server, Agent).

  • MitigationUser Management Component (UMC)siemens_psirt

    In non-networked scenarios/deployments block TCP ports 4002 and 4004 on machines with UMC installed. If the deployment is not using the 'RT Server' type of UMC machine, port 4004 can be blocked everywhere without impacting network functionality for all other UMC machine-types (Server, Ring-Server, Agent).

  • MitigationSIMATIC PCS neo V4.1cisa_csaf_ot

    In non-networked scenarios/deployments block TCP ports 4002 and 4004 on machines with UMC installed. If the deployment is not using the 'RT Server' type of UMC machine, port 4004 can be blocked everywhere without impacting network functionality for all other UMC machine-types (Server, Ring-Server, Agent).

  • MitigationSIMATIC PCS neo V5.0cisa_csaf_ot

    In non-networked scenarios/deployments block TCP ports 4002 and 4004 on machines with UMC installed. If the deployment is not using the 'RT Server' type of UMC machine, port 4004 can be blocked everywhere without impacting network functionality for all other UMC machine-types (Server, Ring-Server, Agent).

  • MitigationSIMATIC PCS neo V6.0cisa_csaf_ot

    In non-networked scenarios/deployments block TCP ports 4002 and 4004 on machines with UMC installed. If the deployment is not using the 'RT Server' type of UMC machine, port 4004 can be blocked everywhere without impacting network functionality for all other UMC machine-types (Server, Ring-Server, Agent).

  • MitigationUser Management Component (UMC)cisa_csaf_ot

    In non-networked scenarios/deployments block TCP ports 4002 and 4004 on machines with UMC installed. If the deployment is not using the 'RT Server' type of UMC machine, port 4004 can be blocked everywhere without impacting network functionality for all other UMC machine-types (Server, Ring-Server, Agent).

  • No fix plannedSIMATIC PCS neo V4.1siemens_psirt

    Currently no fix is planned

  • No fix plannedSIMATIC PCS neo V5.0siemens_psirt

    Currently no fix is planned

  • No fix plannedSIMATIC PCS neo V4.1cisa_csaf_ot

    Currently no fix is planned

  • No fix plannedSIMATIC PCS neo V5.0cisa_csaf_ot

    Currently no fix is planned

02

cvss

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

8.7
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.6–8.7

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · NCSC-NL NL
v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · productcert@siemens.com DEexploitability 3.9 · impact 3.6
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · Siemens ProductCERT DE
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · CISA US
v4.08.7highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:Nsecondary · ENISA EU
v4.08.7highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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
v4.06.6mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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)
03

ssvc

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

Trackcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-125USCWE-125USCWE-125USCWE-125USCWE-125US
05

affected products (34)

Products and version ranges known to be affected.

showing 20 of 34
06

advisories (3)

Vendor and ecosystem advisories describing this.

  • NCSC-2025-0274Kwetsbaarheden verholpen in Siemens productenNL2025-09-09csaf · ncsc_nlNL

    Siemens heeft kwetsbaarheden verholpen in diverse producten als Apogee, Industial Edge, RUGGEDCOM, SIMATIC, SIMOTION en SINAMICS.

  • SSA-722410SSA-722410: Multiple Vulnerabilities in User Management Component (UMC)2025-09-09csaf · siemens_psirtDE

    Siemens' User Management Component (UMC) is affected by multiple vulnerabilities that could allow an unauthenticated remote attacker to execute arbitrary code or to cause a denial of service condition. Siemens has released a new version for User Management Component (UMC) and recommends to update to the latest version. Siemens recommends specific countermeasures for products where fixes are not, or not yet available.

  • ICSA-25-254-07Siemens User Management Component (UMC)2025-09-09icsa · cisa_csaf_otUS

    Siemens' User Management Component (UMC) is affected by multiple vulnerabilities that could allow an unauthenticated remote attacker to execute arbitrary code or to cause a denial of service condition. Siemens has released a new version for User Management Component (UMC) and recommends to update to the latest version. Siemens recommends specific countermeasures for products where fixes are not, or not yet available.

07

also known as (4)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducisa_csaf_otncsc_nlsiemens_psirtNVDCVE.orgMITRE
published 2025-09-09modified 2026-10-23
09

references (5)

External citations — patches, advisories, analysis.

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