Vulnerability CVE-2021-25664


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 the Hop-by-Hop extension header in IPv6 packets and its options lacks any checks against the length field of the header, allowing attackers to put the function into an infinite loop by supplying arbitrary 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 net 
Siemens -> Vstar 
Siemens -> Nucleus source code 
Siemens -> Nucleus 4 
Siemens -> Nucleus readystart 

 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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