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Fencer Vulns
high 8.3

CVE-2025-40743 json

A vulnerability has been identified in SINUMERIK 828D PPU.4 (All versions < V4.95 SP5), SINUMERIK 828D PPU.5 (All versions < V5.25 SP1), SI…

published 2025-08-12 14 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-24245

cvss
8.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

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.

Patch / fix

  • Siemens SINUMERIK 828D PPU.4 V4.95 SP5
  • Siemens SINUMERIK 828D PPU.5 V5.25 SP1
  • Siemens SINUMERIK 840D sl V4.95 SP5
  • Siemens SINUMERIK MC V1.25 SP1
  • Siemens SINUMERIK MC V1.15 V1.15 SP5
  • Siemens SINUMERIK ONE V6.25 SP1
  • Siemens SINUMERIK ONE V6.15 V6.15 SP5

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-25-226-19 updated cvss 8.3

Siemens SINUMERIK

  • Siemens SINUMERIK 828D PPU.4 <V4.95_SP5
    affected: fixed in V4.95, mitigation
  • Siemens SINUMERIK 828D PPU.5 <V5.25_SP1
    affected: fixed in V5.25, mitigation
  • Siemens SINUMERIK 840D sl <V4.95_SP5
    affected: fixed in V4.95, mitigation
  • Siemens SINUMERIK MC <V1.25_SP1
    affected: fixed in V1.25, mitigation
  • Siemens SINUMERIK MC V1.15 <V1.15_SP5
    affected: fixed in V1.15, mitigation
  • Siemens SINUMERIK ONE <V6.25_SP1
    affected: fixed in V6.25, mitigation
  • Siemens SINUMERIK ONE V6.15 <V6.15_SP5
    affected: fixed in V6.15, mitigation

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
14 mo ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.3 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
CNA 4.0 8.7 CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
CNA 4.0 8.7 CVSS: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:X

Affected products

  • Siemens SINUMERIK 828D PPU.4
  • Siemens SINUMERIK 828D PPU.5
  • Siemens SINUMERIK 840D sl
  • Siemens SINUMERIK MC
  • Siemens SINUMERIK MC V1.15
  • Siemens SINUMERIK ONE
  • Siemens SINUMERIK ONE V6.15

Classification

Weakness
  • CWE-288 Authentication Bypass Using an Alternate Path or Channel

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.