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TI-2025-27211 Aliases CVE-2025-40743GHSA-mr3f-gmg7-3h9c

Authentication bypass in Siemens SINUMERIK 828D PPU.4

Priority LOW 39CWE-288Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-288.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00264 18th percentileScored 2026-11-07
Fix Fixed SINUMERIK 828D PPU.4 (Siemens): V4.95 SP5SINUMERIK 828D PPU.5 (Siemens): V5.25 SP1+5 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SiemensSINUMERIK 828D PPU.4before V4.95 SP5V4.95 SP5Patch availableCNA
SiemensSINUMERIK 828D PPU.5before V5.25 SP1V5.25 SP1Patch availableCNA
SiemensSINUMERIK 840D slbefore V4.95 SP5V4.95 SP5Patch availableCNA
SiemensSINUMERIK MCbefore V1.25 SP1V1.25 SP1Patch availableCNA
SiemensSINUMERIK MC V1.15before V1.15 SP5V1.15 SP5Patch availableCNA
SiemensSINUMERIK ONEbefore V6.25 SP1V6.25 SP1Patch availableCNA
SiemensSINUMERIK ONE V6.15before V6.15 SP5V6.15 SP5Patch availableCNA
  • SINUMERIK 828D PPU.4 VendorSiemens Affected before V4.95 SP5 Fixed in V4.95 SP5 Patch available CNA
  • SINUMERIK 828D PPU.5 VendorSiemens Affected before V5.25 SP1 Fixed in V5.25 SP1 Patch available CNA
  • SINUMERIK 840D sl VendorSiemens Affected before V4.95 SP5 Fixed in V4.95 SP5 Patch available CNA
  • SINUMERIK MC VendorSiemens Affected before V1.25 SP1 Fixed in V1.25 SP1 Patch available CNA
  • SINUMERIK MC V1.15 VendorSiemens Affected before V1.15 SP5 Fixed in V1.15 SP5 Patch available CNA
  • SINUMERIK ONE VendorSiemens Affected before V6.25 SP1 Fixed in V6.25 SP1 Patch available CNA
  • SINUMERIK ONE V6.15 VendorSiemens Affected before V6.15 SP5 Fixed in V6.15 SP5 Patch available CNA

Remediation

  • Fix · CNA SINUMERIK 828D PPU.4 (Siemens) Fixed in V4.95 SP5
  • Fix · CNA SINUMERIK 828D PPU.5 (Siemens) Fixed in V5.25 SP1
  • Fix · CNA SINUMERIK 840D sl (Siemens) Fixed in V4.95 SP5
  • Fix · CNA SINUMERIK MC (Siemens) Fixed in V1.25 SP1
  • Fix · CNA SINUMERIK MC V1.15 (Siemens) Fixed in V1.15 SP5
  • Fix · CNA SINUMERIK ONE (Siemens) Fixed in V6.25 SP1
  • Fix · CNA SINUMERIK ONE V6.15 (Siemens) Fixed in V6.15 SP5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-40743
  2. 2026-10-03 Alias added: GHSA-mr3f-gmg7-3h9c

References

Other 1

  • TI-2026-20057 Authentication bypass in Fortinet FortiWeb KEVCVSS 3.1CRITICAL 9.4
  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-18911 Heap-based buffer overflow in Fortinet FortiSwitchManager KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-09686 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-07142 Code injection in Spring Framework KEVCVSS 3.1CRITICAL 9.8
  • TI-2021-19919 Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints KEVCVSS 3.1CRITICAL 10.0
See all 2487 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences