Vulnerability in Siemens Logo! Cmr2020
CVE-2021-37186
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.
EPSS: 0.004 (28.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
Affected products
- Siemens Logo! Cmr2020 — versions All versions < V2.2
- Siemens Logo\!_cmr2020
- Siemens Logo\!_cmr2020_firmware
- Siemens Logo! Cmr2040 — versions All versions < V2.2
- Siemens Logo\!_cmr2040
- Siemens Logo\!_cmr2040_firmware
- Siemens Simatic Rtu3010c — versions All versions < V4.0.9
- Siemens Simatic_rtu3010c
- Siemens Simatic_rtu3010c_firmware
- Siemens Simatic Rtu3030c — versions All versions < V4.0.9
Weakness classification (CWE)
References
- productcert@siemens.com (Patch, x_refsource_MISC, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-37186?
- CVE-2021-37186 is a medium-severity vulnerability in Siemens Logo! Cmr2020, classified under Use of Insufficiently Random Values. CVSS score: 5.4/10. Published 2021-09-14.
- How severe is CVE-2021-37186?
- Medium severity. CVSS v3 base score is 5.4 out of 10.