Main Vulnerability Database Vulnerabilities #VU52207

Use of insufficiently random values in Siemens products - CVE-2021-27393

Published: April 14, 2021 / Updated: April 15, 2021

Vulnerability identifier: #VU52207

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-27393

CWE-ID: CWE-330

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to the DNS client does not properly randomize UDP port numbers of DNS requests. A remote attacker can poison the DNS cache or spoof DNS resolving.

Affected software

Nucleus NET
Nucleus RTOS
Nucleus Source Code
VSTAR
Nucleus ReadyStart

How to mitigate CVE-2021-27393

Install updates from vendor's website.

Nucleus ReadyStart - update to 2013.08

External References

Related Security Bulletins