CVE-2025-40743

highpriority · track · 0OT risk · elevatedEPSS 0.002 · 15 %ileDEEUNLRUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.24% (15th) EPSS
CVSS 8.3 · high
Is it mine?
126 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-22

A vulnerability has been identified in SINUMERIK 828D PPU.4 (All versions < V4.95 SP5), SINUMERIK 828D PPU.5 (All versions < V5.25 SP1), SINUMERIK 840D sl (All versions < V4.95 SP5), SINUMERIK MC (All versions < V1.25 SP1), SINUMERIK MC V1.15 (All versions < V1.15 SP5), SINUMERIK ONE (All versions < V6.25 SP1), SINUMERIK ONE V6.15 (All versions < V6.15 SP5). The affected application improperly validates authentication for its VNC access service, allowing access with insufficient password verification. This could allow an attacker to gain unauthorized remote access and potentially compromise system confidentiality, integrity, or availability.

01

remediations

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

A vendor fix is available.

  • FixedSINUMERIK 828D PPU.4siemens_psirt

    Update to V4.95 SP5 or later version Updated software version can be obtained from Siemens customer support or a local partner.

  • FixedSINUMERIK 828D PPU.5siemens_psirt

    Update to V5.25 SP1 or later version Updated software version can be obtained from Siemens customer support or a local partner.

  • FixedSINUMERIK 840D slsiemens_psirt

    Update to V4.95 SP5 or later version Updated software version can be obtained from Siemens customer support or a local partner.

  • FixedSINUMERIK MCsiemens_psirt

    Update to V1.25 SP1 or later version Updated software version can be obtained from Siemens customer support or a local partner.

  • FixedSINUMERIK MC V1.15siemens_psirt

    Update to V1.15 SP5 or later version Updated software version can be obtained from Siemens customer support or a local partner.

  • FixedSINUMERIK ONEsiemens_psirt

    Update to V6.25 SP1 or later version Updated software version can be obtained from Siemens customer support or a local partner.

  • FixedSINUMERIK ONE V6.15siemens_psirt

    Update to V6.15 SP5 or later version Updated software version can be obtained from Siemens customer support or a local partner.

  • FixedSINUMERIK 828D PPU.4cisa_csaf_ot

    Update to V4.95 SP5 or later version Updated software version can be obtained from Siemens customer support or a local partner.

  • FixedSINUMERIK 828D PPU.5cisa_csaf_ot

    Update to V5.25 SP1 or later version Updated software version can be obtained from Siemens customer support or a local partner.

  • FixedSINUMERIK 840D slcisa_csaf_ot

    Update to V4.95 SP5 or later version Updated software version can be obtained from Siemens customer support or a local partner.

  • FixedSINUMERIK MCcisa_csaf_ot

    Update to V1.25 SP1 or later version Updated software version can be obtained from Siemens customer support or a local partner.

  • FixedSINUMERIK MC V1.15cisa_csaf_ot

    Update to V1.15 SP5 or later version Updated software version can be obtained from Siemens customer support or a local partner.

  • FixedSINUMERIK ONEcisa_csaf_ot

    Update to V6.25 SP1 or later version Updated software version can be obtained from Siemens customer support or a local partner.

  • FixedSINUMERIK ONE V6.15cisa_csaf_ot

    Update to V6.15 SP5 or later version Updated software version can be obtained from Siemens customer support or a local partner.

  • MitigationSINUMERIK 828D PPU.4siemens_psirt

    Apply Defense-in-Depth

  • MitigationSINUMERIK 828D PPU.5siemens_psirt

    Apply Defense-in-Depth

  • MitigationSINUMERIK 840D slsiemens_psirt

    Apply Defense-in-Depth

  • MitigationSINUMERIK MCsiemens_psirt

    Apply Defense-in-Depth

  • MitigationSINUMERIK MC V1.15siemens_psirt

    Apply Defense-in-Depth

  • MitigationSINUMERIK ONEsiemens_psirt

    Apply Defense-in-Depth

  • MitigationSINUMERIK ONE V6.15siemens_psirt

    Apply Defense-in-Depth

  • MitigationSINUMERIK 828D PPU.4cisa_csaf_ot

    Apply Defense-in-Depth

  • MitigationSINUMERIK 828D PPU.5cisa_csaf_ot

    Apply Defense-in-Depth

  • MitigationSINUMERIK 840D slcisa_csaf_ot

    Apply Defense-in-Depth

  • MitigationSINUMERIK MCcisa_csaf_ot

    Apply Defense-in-Depth

  • MitigationSINUMERIK MC V1.15cisa_csaf_ot

    Apply Defense-in-Depth

  • MitigationSINUMERIK ONEcisa_csaf_ot

    Apply Defense-in-Depth

  • MitigationSINUMERIK ONE V6.15cisa_csaf_ot

    Apply Defense-in-Depth

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 · 6.2–8.7

v3.18.3highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Lsecondary · NCSC-NL NL
v3.18.3highAV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Lsecondary · FSTEC (BDU) RU
v3.18.3highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Lsecondary · productcert@siemens.com DEexploitability 2.8 · impact 5.5
v3.18.3highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Lsecondary · Siemens ProductCERT DE
v3.18.3highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Lsecondary · CISA US
v4.08.7highCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:Nsecondary · ENISA EU
v4.08.7highCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/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
v4.06.2mediumCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/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.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-288USCWE-288USCWE-288USCWE-288USCWE-288US
05

affected products (126)

Products and version ranges known to be affected.

showing 20 of 126
06

advisories (3)

Vendor and ecosystem advisories describing this.

  • NCSC-2025-0246Kwetsbaarheden verholpen in Siemens productenNL2025-08-12csaf · ncsc_nlNL

    Siemens heeft kwetsbaarheden verholpen in diverse producten als SIMATIC, SINEC, SIMAC, RUGGEDCOM, SIMOTION, SINAMICS, SIPROTEC en SINUMERIK.

  • SSA-177847SSA-177847: Improper VNC Password Check Vulnerability in SINUMERIK Controllers2025-08-12csaf · siemens_psirtDE

    Siemens SINUMERIK Controllers are affected by an improper VNC password check vulnerability. Siemens has released new versions for the affected products and recommends to update to the latest versions.

  • ICSA-25-226-19Siemens SINUMERIK2025-08-12icsa · cisa_csaf_otUS

    Siemens SINUMERIK Controllers are affected by an improper VNC password check vulnerability. Siemens has released new versions for the affected products and recommends to update to the latest versions.

07

also known as (5)

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 2025-08-12modified 2026-06-17
09

references (3)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan