CVSS 3.1
5.4 mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NCVE-2021-37186
Medium (5.4) in siemens. EPSS 0.4% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 29% of CVEs (scores of 2026-10-31)
- CWE
- CWE-330
- Published
- Modified
- Record from
- the NVD, synced
Affected
- siemens:logo\!_cmr2020_firmware
- siemens:logo\!_cmr2040_firmware
- siemens:simatic_rtu3010c_firmware
- siemens:simatic_rtu3030c_firmware
- siemens:simatic_rtu3031c_firmware
- siemens:simatic_rtu3041c_firmware