CVEvulnerability

CVE-2021-37186

5.4 MEDIUM Published 2021-09-14 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-09-14
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.4 MEDIUM — CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS 2.0 ([email protected])
4.8 MEDIUM — AV:A/AC:L/Au:N/C:P/I:P/A:N
Weaknesses
CWE-330

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 configurations

• siemens logo\! cmr2020 firmware (< 2.2) • siemens logo\! cmr2040 firmware (< 2.2) • siemens simatic rtu3010c firmware (< 4.0.9) • siemens simatic rtu3030c firmware (< 4.0.9) • siemens simatic rtu3031c firmware (< 4.0.9) • siemens simatic rtu3041c firmware (< 4.0.9)

Related

Weakness · CWE (1)

  • CWE-330 Use of Insufficiently Random Values weakness

References