CVE-2021-37186

Severity Score

5.4

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Se ha identificado una vulnerabilidad en LOGO! CMR2020 (Todas las versiones anteriores a la versión V2.2), LOGO! CMR2040 (Todas las versiones anteriores a la versión V2.2), SIMATIC RTU3010C (Todas las versiones anteriores a la versión V4.0.9), SIMATIC RTU3030C (Todas las versiones anteriores a la versión V4.0.9), SIMATIC RTU3031C (Todas las versiones anteriores a la versión V4.0.9), SIMATIC RTU3041C (Todas las versiones anteriores a la versión V4.0.9). La pila TCP/IP subyacente no calcula apropiadamente los números aleatorios usados como ISN (Initial Sequence Numbers). Un atacante adyacente con acceso a la red de la interfaz LAN podría interferir en el tráfico, falsear la conexión y conseguir acceso a información confidencial

*Credits: N/A

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Adjacent

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-07-21 CVE Reserved
2021-09-14 CVE Published
2024-05-30 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-330: Use of Insufficiently Random Values

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://cert-portal.siemens.com/productcert/pdf/ssa-316383.pdf	2022-04-29

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Siemens Search vendor "Siemens"	Logo\! Cmr2020 Firmware Search vendor "Siemens" for product "Logo\! Cmr2020 Firmware"	< 2.2 Search vendor "Siemens" for product "Logo\! Cmr2020 Firmware" and version " < 2.2"	-	Affected	in	Siemens Search vendor "Siemens"	Logo\! Cmr2020 Search vendor "Siemens" for product "Logo\! Cmr2020"	-	-	Safe
Siemens Search vendor "Siemens"	Logo\! Cmr2040 Firmware Search vendor "Siemens" for product "Logo\! Cmr2040 Firmware"	< 2.2 Search vendor "Siemens" for product "Logo\! Cmr2040 Firmware" and version " < 2.2"	-	Affected	in	Siemens Search vendor "Siemens"	Logo\! Cmr2040 Search vendor "Siemens" for product "Logo\! Cmr2040"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Rtu3010c Firmware Search vendor "Siemens" for product "Simatic Rtu3010c Firmware"	< 4.0.9 Search vendor "Siemens" for product "Simatic Rtu3010c Firmware" and version " < 4.0.9"	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Rtu3010c Search vendor "Siemens" for product "Simatic Rtu3010c"	*	-	Safe
Siemens Search vendor "Siemens"	Simatic Rtu3030c Firmware Search vendor "Siemens" for product "Simatic Rtu3030c Firmware"	< 4.0.9 Search vendor "Siemens" for product "Simatic Rtu3030c Firmware" and version " < 4.0.9"	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Rtu3030c Search vendor "Siemens" for product "Simatic Rtu3030c"	*	-	Safe
Siemens Search vendor "Siemens"	Simatic Rtu3031c Firmware Search vendor "Siemens" for product "Simatic Rtu3031c Firmware"	< 4.0.9 Search vendor "Siemens" for product "Simatic Rtu3031c Firmware" and version " < 4.0.9"	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Rtu3031c Search vendor "Siemens" for product "Simatic Rtu3031c"	*	-	Safe
Siemens Search vendor "Siemens"	Simatic Rtu3041c Firmware Search vendor "Siemens" for product "Simatic Rtu3041c Firmware"	< 4.0.9 Search vendor "Siemens" for product "Simatic Rtu3041c Firmware" and version " < 4.0.9"	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Rtu3041c Search vendor "Siemens" for product "Simatic Rtu3041c"	*	-	Safe