Vulnerability · Published Aug 12, 2025 · Assigned by siemens
CVE-2025-40743
High 8.3
In plain English
A high-severity authentication bypass in SINUMERIK 828D PPU.4 from Siemens. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).
Official 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 products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Siemens | SINUMERIK 828D PPU.4 | 0 – before V4.95 SP5 |
| Siemens | SINUMERIK 828D PPU.5 | 0 – before V5.25 SP1 |
| Siemens | SINUMERIK 840D sl | 0 – before V4.95 SP5 |
| Siemens | SINUMERIK MC | 0 – before V1.25 SP1 |
| Siemens | SINUMERIK MC V1.15 | 0 – before V1.15 SP5 |
| Siemens | SINUMERIK ONE | 0 – before V6.25 SP1 |
| Siemens | SINUMERIK ONE V6.15 | 0 – before V6.15 SP5 |
Weakness: CWE-288 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L