CVE-2025-40743

HIGH

8.3

CVSS Score

Published: August 12, 2025 at 11:17 AM UTC

Updated: June 17, 2026 at 09:22 AM UTC

4 products affected across 1 vendorSINUMERIK 840D slSINUMERIK ONESINUMERIK 828D

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Severity

HIGH8.3

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

SINUMERIK 828D · Siemens

60%

v < V4.95 SP5v < V5.25 SP1

Affected range stops below V4.95 SP5, so it looks safe — our inference, not a vendor statement

Affected range stops below V5.25 SP1, so it looks safe — our inference, not a vendor statement

SINUMERIK 840D sl · Siemens

60%

v < V4.95 SP5

Affected range stops below V4.95 SP5, so it looks safe — our inference, not a vendor statement

SINUMERIK MC · Siemens

60%

v < V1.15 SP5v < V1.25 SP1

Affected range stops below V1.15 SP5, so it looks safe — our inference, not a vendor statement

Affected range stops below V1.25 SP1, so it looks safe — our inference, not a vendor statement

SINUMERIK ONE · Siemens

60%

v < V6.15 SP5v < V6.25 SP1

Affected range stops below V6.15 SP5, so it looks safe — our inference, not a vendor statement

Affected range stops below V6.25 SP1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: [email protected]

https://cert-portal.siemens.com/productcert/html/ssa-177847.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.3HIGHsiemens

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-288

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