CVE-2021-37186

Common vulnerabilities & exposures (CVE)

CVE database CVE database blogpost Release & EoL database

Published at: - 14-09-2021 01:15

Last modified: - 29-04-2022 07:19

Total changes: - 4

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.

Common Vulnerability Scoring System (CVSS)

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

Low

Attack complexity

Adjacent

Attack vector

None

Availability

Low

Confidentiality

Low

Integrity

None

Privileges required

Unchanged

Scope

None

User interaction

5.4

Base score

2.8

2.5

Exploitability score

Impact score

Verification logic

AND

vendor=siemens AND product=logo\!_cmr2020_firmware AND versionEndExcluding=2.2

vendor=siemens AND product=logo\!_cmr2020 AND version=-

AND

vendor=siemens AND product=logo\!_cmr2040_firmware AND versionEndExcluding=2.2

vendor=siemens AND product=logo\!_cmr2040 AND version=-

AND

vendor=siemens AND product=simatic_rtu3010c_firmware AND versionEndExcluding=4.0.9

vendor=siemens AND product=simatic_rtu3010c

AND

vendor=siemens AND product=simatic_rtu3030c_firmware AND versionEndExcluding=4.0.9

vendor=siemens AND product=simatic_rtu3030c

AND

vendor=siemens AND product=simatic_rtu3031c_firmware AND versionEndExcluding=4.0.9

vendor=siemens AND product=simatic_rtu3031c

AND

vendor=siemens AND product=simatic_rtu3041c_firmware AND versionEndExcluding=4.0.9

vendor=siemens AND product=simatic_rtu3041c

Reference

https://cert-portal.siemens.com/productcert/pdf/ssa-316383.pdf

Keywords

CVE-2021-37186

Common vulnerabilities & exposures (CVE)

Description

Common Vulnerability Scoring System (CVSS)

Verification logic

Reference

NVD

CVE-2021-37186

CVE

Common vulnerabilities & exposures

CVSS

Common vulnerability scoring system

Security

Vulnerabilities

Exposures