CVE-2021-37186
Last modified
CVE-2021-37186 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. 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). EPSS estimates a 0.34% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| 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 |
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-316383.pdfPatch, Vendor Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-316383.pdfPatch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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