Vulnerability CVE-2021-25663
Published: 2021-04-22   Modified: 2021-04-23

Description:
A vulnerability has been identified in Nucleus 4 (All versions < V4.1.0), Nucleus NET (All versions), Nucleus ReadyStart (All versions), Nucleus Source Code (versions including affected IPv6 stack), VSTAR (versions including affected IPv6 stack). The function that processes IPv6 headers does not check the lengths of extension header options, allowing attackers to put this function into an infinite loop with crafted length values.

Type:

CWE-835

 (Loop with Unreachable Exit Condition ('Infinite Loop'))

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

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
None
Partial
Affected software
Siemens -> Nucleus 4 
Siemens -> Nucleus net 
Siemens -> Nucleus readystart 
Siemens -> Nucleus source code 
Siemens -> Vstar 

 References:
https://cert-portal.siemens.com/productcert/pdf/ssa-248289.pdf
https://us-cert.cisa.gov/ics/advisories/icsa-21-103-05
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