CVE-2021-37199: Siemens Sinumerik 808d Firmware

High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days.

A vulnerability has been identified in SINUMERIK 808D (All versions), SINUMERIK 828D (All versions < V4.95). Affected devices don't process correctly certain special crafted packets sent to port 102/tcp, which could allow an attacker to cause a denial-of-service in the device.

Affected products

• Siemens Sinumerik 808d Firmware: any version
• Siemens Sinumerik 828d Firmware: before 4.95 (fixed in 4.95)

Published 2021-10-12. Last modified 2026-06-17.