CVE-2021-37186

MediumCVSS 5.4/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 5.4/10CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Weakness enumeration

CWE-330

Affected software

No affected versions have been published.

Timeline

Published
Sep 14, 2021
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2021-37186: Medium severity, CVSS 5.4 | Vulnix