CVE-2021-34569: Wago 750-8100 Firmware

Critical severity, CVSS 9.8. EPSS: 0.9% chance of exploitation in the next 30 days.

In WAGO I/O-Check Service in multiple products an attacker can send a specially crafted packet containing OS commands to crash the diagnostic tool and write memory.

Affected products

  • Wago 750-8100 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 750-8101/025-000 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 750-8101 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 750-8102/025-000 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 750-8102 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 750-8202/000-011 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 750-8202/000-012 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 750-8202/000-022 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 750-8202/025-000 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 750-8202/025-001 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 750-8202/025-002 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 750-8202/040-000 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 750-8202/040-001 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 750-8202 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 752-8303/8000-002 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 762-4101 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 762-4102 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 762-4103 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 762-4104 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 762-4201/8000-001 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 762-4202/8000-001 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 762-4203/8000-001 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 762-4204/8000-001 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 762-4205/8000-001 Firmware: before 18 (fixed in 18); version 18 only
  • Wago 762-4205/8000-002 Firmware: before 18 (fixed in 18); version 18 only
  • and 24 more

Published 2022-11-09. Last modified 2026-06-17.