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 v4.0: 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/E:U/U:Green
CVE-ID: CVE-2021-27393
CWE-ID: CWE-330
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Siemens
Affected software:
Nucleus NET
Nucleus RTOS
Nucleus Source Code
VSTAR
Nucleus ReadyStart
Nucleus NET
Nucleus RTOS
Nucleus Source Code
VSTAR
Nucleus ReadyStart
Detailed vulnerability description
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.
How to mitigate CVE-2021-27393
Install updates from vendor's website.