Vulnerability in Siemens Sinumerik 828d Ppu.4

CVE-2025-40743

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…

EPSS: 0.000 (8.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-40743?
CVE-2025-40743 is a high-severity vulnerability in Siemens Sinumerik 828d Ppu.4, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 8.3/10. Published 2025-08-12.
How severe is CVE-2025-40743?
High severity. CVSS v3 base score is 8.3 out of 10.