CVE-2021-37186

14.09.2021, 11:15

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	NIST	5.4 MEDIUM	ADJACENT_NETWORK	LOW	NONE	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
siemens	CNA	---				---
CVE	ADP	---				---

Base Score

CVSS 3.x

EPSS Score

Percentile: 38%

Vendor	Product	Version
siemens	logo\!_cmr2020_firmware	𝑥 < 2.2
siemens	logo\!_cmr2040_firmware	𝑥 < 2.2
siemens	simatic_rtu3010c_firmware	𝑥 < 4.0.9
siemens	simatic_rtu3030c_firmware	𝑥 < 4.0.9
siemens	simatic_rtu3031c_firmware	𝑥 < 4.0.9
siemens	simatic_rtu3041c_firmware	𝑥 < 4.0.9

𝑥

= Vulnerable software versions

Common Weakness Enumeration

CWE-330 - Use of Insufficiently Random Values
The software uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.

References

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