CVE-2021-37186
Medium
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.
SeverityMedium
CVSS5.4
Exploit probability—
ProductSiemens Simatic Rtu3010c Firmware
PublishedSep 14, 2021
First seenSep 14, 2021
Weakness typeCWE-330CWE-330
How to fix
Update
- siemens simatic_rtu3010c_firmware4.0.9 or later
- siemens logo\!_cmr2020_firmware2.2 or later
- siemens logo\!_cmr2040_firmware2.2 or later
- siemens simatic_rtu3030c_firmware4.0.9 or later
- siemens simatic_rtu3031c_firmware4.0.9 or later
- siemens simatic_rtu3041c_firmware4.0.9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| siemens simatic_rtu3010c_firmware | v < 4.0.9 | 4.0.9 |
| siemens logo\!_cmr2020_firmware | v < 2.2 | 2.2 |
| siemens logo\!_cmr2040_firmware | v < 2.2 | 2.2 |
| siemens simatic_rtu3030c_firmware | v < 4.0.9 | 4.0.9 |
| siemens simatic_rtu3031c_firmware | v < 4.0.9 | 4.0.9 |
| siemens simatic_rtu3041c_firmware | v < 4.0.9 | 4.0.9 |
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