CVE-2019-12549: Wago 852-1305 Firmware

Critical severity, CVSS 9.8. EPSS: 3.3% chance of exploitation in the next 30 days.

WAGO 852-303 before FW06, 852-1305 before FW06, and 852-1505 before FW03 devices contain hardcoded private keys for the SSH daemon. The fingerprint of the SSH host key from the corresponding SSH daemon matches the embedded private key.

Affected products

• Wago 852-1305 Firmware: before 1.1.6.s0 (fixed in 1.1.6.s0)
• Wago 852-1505 Firmware: before 1.1.5.s0 (fixed in 1.1.5.s0)
• Wago 852-303 Firmware: before 1.2.2.s0 (fixed in 1.2.2.s0)

Published 2019-06-17. Last modified 2026-06-17.