Use of insufficiently random values in Siemens products - CVE-2021-37186
Published: September 16, 2021
Vulnerability identifier: #VU56654
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-37186
CWE-ID: CWE-330
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerable software:
SIMATIC RTU 3000
LOGO! CMR2020
LOGO! CMR2040
SIMATIC RTU 3000
LOGO! CMR2020
LOGO! CMR2040
Software vendor:
Siemens
Siemens
Description
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to the underlying TCP/IP stack does not properly calculate the random numbers used as ISN (Initial Sequence Numbers). A remote attacker on the local network can spoof the connection and gain access to sensitive information.
Remediation
Install updates from vendor's website.