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CVE-2021-37186

MEDIUM CVSS: 5.4 Published: 2021-09-14 Modified: 2026-06-17

Description

A vulnerability has been identified in LOGO! CMR2020 (All versions < V2.2), LOGO! CMR2040 (All versions < V2.2), SIMATIC RTU3010C (All versions < V4.0.9), SIMATIC RTU3030C (All versions < V4.0.9), SIMATIC RTU3031C (All versions < V4.0.9), SIMATIC RTU3041C (All versions < V4.0.9). The underlying TCP/IP stack does not properly calculate the random numbers used as ISN (Initial Sequence Numbers). An adjacent attacker with network access to the LAN interface could interfere with traffic, spoof the connection and gain access to sensitive information.

Affected Platforms

Siemens Logo\! Cmr2020 FirmwareSiemens Simatic Rtu3031C FirmwareSiemens Simatic Rtu3031CSiemens Logo\! Cmr2040Siemens Simatic Rtu3041CSiemens Logo\! Cmr2020Siemens Simatic Rtu3010C FirmwareSiemens Logo\! Cmr2040 FirmwareSiemens Simatic Rtu3030CSiemens Simatic Rtu3041C Firmware

Weakness Type

CWE-330, CWE-330

References