CVE-2021-25664

Published: Apr 22, 2021Modified: Jun 17, 2026

8.7

Vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XShow less

Source: productcert@siemens.com (Secondary)

Description

A vulnerability has been identified in Capital Embedded AR Classic 431-422 (All versions), Capital Embedded AR Classic R20-11 (All versions < V2303), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (All 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.

Affected (5)

Products: Siemens: Capital Vstar, Nucleus Net, Nucleus Readystart V3, Nucleus Readystart V4, Nucleus Source Code

Siemens

5 products

Capital Vstar

Nucleus Net

Nucleus Readystart V3

Nucleus Readystart V4

Nucleus Source Code

Configuration A

5 vulnerable

Vulnerable Software	Affected Versions
Siemens Capital Vstar	All versions
Siemens Nucleus Net	All versions
Siemens Nucleus Readystart V3	Before 2017.02.4
Siemens Nucleus Readystart V4	Before 4.1.0
Siemens Nucleus Source Code	All versions