Vulnerability CVE-2021-27393
Published: 2021-04-22   Modified: 2021-04-23

Description:
A vulnerability has been identified in Nucleus NET (All versions), Nucleus RTOS (versions including affected DNS modules), Nucleus ReadyStart (All versions < V2013.08), Nucleus Source Code (versions including affected DNS modules), VSTAR (versions including affected DNS modules). The DNS client does not properly randomize UDP port numbers of DNS requests. That could allow an attacker to poison the DNS cache or spoof DNS resolving.

Type:

CWE-330

 (Use of Insufficiently Random Values)

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None
Affected software
Siemens -> Nucleus net 
Siemens -> Nucleus rtos 
Siemens -> Vstar 
Siemens -> Nucleus source code 
Siemens -> Nucleus readystart 

 References:
https://cert-portal.siemens.com/productcert/pdf/ssa-201384.pdf
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