CVE-2021-25663

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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 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.

Se ha identificado una vulnerabilidad en Capital VSTAR (Versiones que incluyen la pila IPv6 afectada), Nucleus NET (Todas las versiones), Nucleus ReadyStart V3 (Todas las versiones anteriores a V2017.02.4), Nucleus ReadyStart V4 (Todas las versiones anteriores a V4.1.0), Nucleus Source Code (Versiones que incluyen la pila IPv6 afectada). La función que procesa las cabeceras de IPv6 no comprueba las longitudes de las opciones de las cabeceras de extensión, lo que permite a los atacantes poner esta función en un bucle infinito con valores de longitud manipulados

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-01-21 CVE Reserved
2021-04-22 CVE Published
2024-02-14 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

CAPEC

References (3)

URL	Tag	Source
https://cert-portal.siemens.com/productcert/html/ssa-248289.html
https://us-cert.cisa.gov/ics/advisories/icsa-21-103-05	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://cert-portal.siemens.com/productcert/pdf/ssa-248289.pdf	2024-02-13

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Siemens Search vendor "Siemens"		Capital Vstar Search vendor "Siemens" for product "Capital Vstar"				-		-		Affected
Siemens Search vendor "Siemens"		Nucleus Net Search vendor "Siemens" for product "Nucleus Net"				*		-		Affected
Siemens Search vendor "Siemens"		Nucleus Readystart Search vendor "Siemens" for product "Nucleus Readystart"				< 4.1.0 Search vendor "Siemens" for product "Nucleus Readystart" and version " < 4.1.0"		-		Affected
Siemens Search vendor "Siemens"		Nucleus Source Code Search vendor "Siemens" for product "Nucleus Source Code"				-		-		Affected
Siemens Search vendor "Siemens"		Nucleus Readystart Search vendor "Siemens" for product "Nucleus Readystart"				< 2017.02.4 Search vendor "Siemens" for product "Nucleus Readystart" and version " < 2017.02.4"		-		Affected