CVE-2021-31340: Siemens SIMATIC Reader RF610R Cmiit Firmware

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

A vulnerability has been identified in SIMATIC RF166C (All versions > V1.1 and < V1.3.2), SIMATIC RF185C (All versions > V1.1 and < V1.3.2), SIMATIC RF186C (All versions > V1.1 and < V1.3.2), SIMATIC RF186CI (All versions > V1.1 and < V1.3.2), SIMATIC RF188C (All versions > V1.1 and < V1.3.2), SIMATIC RF188CI (All versions > V1.1 and < V1.3.2), SIMATIC RF360R (All versions < V2.0), SIMATIC Reader RF610R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF610R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF610R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF615R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF615R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF615R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF650R ARIB (All versions > V3.0 < V4.0), SIMATIC Reader RF650R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF650R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF650R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF680R ARIB (All versions > V3.0 < V4.0), SIMATIC Reader RF680R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF680R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF680R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF685R ARIB (All versions > V3.0 < V4.0), SIMATIC Reader RF685R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF685R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF685R FCC (All versions > V3.0 < V4.0). Affected devices do not properly handle large numbers of incoming connections. An attacker may leverage this to cause a Denial-of-Service situation.

Affected products

• Siemens SIMATIC Reader RF610R Cmiit Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF610R Etsi Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF610R Fcc Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF615R Cmiit Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF615R Etsi Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF615R Fcc Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF650R Arib Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF650R Cmiit Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF650R Etsi Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF650R Fcc Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF680R Arib Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF680R Cmiit Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF680R Etsi Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF680R Fcc Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF685R Arib Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF685R Cmiit Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF685R Etsi Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC Reader RF685R Fcc Firmware: from 3.0, before 4.0 (fixed in 4.0)
• Siemens SIMATIC RF166C Firmware: after 1.1, before 1.3.2 (fixed in 1.3.2)
• Siemens SIMATIC RF185C Firmware: after 1.1, before 1.3.2 (fixed in 1.3.2)
• Siemens SIMATIC RF186C Firmware: after 1.1, before 1.3.2 (fixed in 1.3.2)
• Siemens SIMATIC RF186CI Firmware: after 1.1, before 1.3.2 (fixed in 1.3.2)
• Siemens SIMATIC RF188C Firmware: after 1.1, before 1.3.2 (fixed in 1.3.2)
• Siemens SIMATIC RF188CI Firmware: after 1.1, before 1.3.2 (fixed in 1.3.2)
• Siemens SIMATIC RF360R Firmware: before 2.0 (fixed in 2.0)

Published 2021-06-08. Last modified 2026-06-17.