CVE-2021-31376

Junos OS: ACX Series: Packet Forwarding Engine manager (FXPC) process crashes when processing DHCPv6 packets

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An Improper Input Validation vulnerability in Packet Forwarding Engine manager (FXPC) process of Juniper Networks Junos OS allows an attacker to cause a Denial of Service (DoS) by sending specific DHCPv6 packets to the device and crashing the FXPC service. Continued receipt and processing of this specific packet will create a sustained Denial of Service (DoS) condition. This issue affects only the following platforms in ACX Series: ACX500, ACX1000, ACX1100, ACX2100, ACX2200, ACX4000, ACX5048, ACX5096 devices. Other ACX platforms are not affected from this issue. This issue affects Juniper Networks Junos OS on ACX500, ACX1000, ACX1100, ACX2100, ACX2200, ACX4000, ACX5048, ACX5096: 18.4 version 18.4R3-S7 and later versions prior to 18.4R3-S8. This issue does not affect: Juniper Networks Junos OS 18.4 versions prior to 18.4R3-S7 on ACX500, ACX1000, ACX1100, ACX2100, ACX2200, ACX4000, ACX5048, ACX5096.

Una vulnerabilidad de comprobación de entrada inapropiada en el proceso del Administrador del Motor de Reenvío de Paquetes (FXPC) de Juniper Networks Junos OS permite a un atacante causar una Denegación de Servicio (DoS) mediante el envío de paquetes DHCPv6 específicos al dispositivo y el bloqueo del servicio FXPC. La recepción y el procesamiento continuados de este paquete específico crearán una condición de Denegación de Servicio (DoS) sostenida. Este problema afecta sólo a las siguientes plataformas de la serie ACX: ACX500, ACX1000, ACX1100, ACX2100, ACX2200, ACX4000, ACX5048, ACX5096. Otras plataformas ACX no están afectadas por este problema. Este problema afecta a Juniper Networks Junos OS en ACX500, ACX1000, ACX1100, ACX2100, ACX2200, ACX4000, ACX5048, ACX5096: versión 18.4 18.4R3-S7 y versiones posteriores anteriores a 18.4R3-S8. Este problema no afecta: Juniper Networks Junos OS versiones 18.4 anteriores a 18.4R3-S7 en ACX500, ACX1000, ACX1100, ACX2100, ACX2200, ACX4000, ACX5048, ACX5096

*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

2021-04-15 CVE Reserved
2021-10-19 CVE Published
2024-06-28 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://kb.juniper.net/JSA11241	2021-10-25

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Juniper Search vendor "Juniper"	Junos Search vendor "Juniper" for product "Junos"	18.4 Search vendor "Juniper" for product "Junos" and version "18.4"	r3-s7	Affected	in	Juniper Search vendor "Juniper"	Acx1000 Search vendor "Juniper" for product "Acx1000"	-	-	Safe
Juniper Search vendor "Juniper"	Junos Search vendor "Juniper" for product "Junos"	18.4 Search vendor "Juniper" for product "Junos" and version "18.4"	r3-s7	Affected	in	Juniper Search vendor "Juniper"	Acx1100 Search vendor "Juniper" for product "Acx1100"	-	-	Safe
Juniper Search vendor "Juniper"	Junos Search vendor "Juniper" for product "Junos"	18.4 Search vendor "Juniper" for product "Junos" and version "18.4"	r3-s7	Affected	in	Juniper Search vendor "Juniper"	Acx2100 Search vendor "Juniper" for product "Acx2100"	-	-	Safe
Juniper Search vendor "Juniper"	Junos Search vendor "Juniper" for product "Junos"	18.4 Search vendor "Juniper" for product "Junos" and version "18.4"	r3-s7	Affected	in	Juniper Search vendor "Juniper"	Acx2200 Search vendor "Juniper" for product "Acx2200"	-	-	Safe
Juniper Search vendor "Juniper"	Junos Search vendor "Juniper" for product "Junos"	18.4 Search vendor "Juniper" for product "Junos" and version "18.4"	r3-s7	Affected	in	Juniper Search vendor "Juniper"	Acx4000 Search vendor "Juniper" for product "Acx4000"	-	-	Safe
Juniper Search vendor "Juniper"	Junos Search vendor "Juniper" for product "Junos"	18.4 Search vendor "Juniper" for product "Junos" and version "18.4"	r3-s7	Affected	in	Juniper Search vendor "Juniper"	Acx500 Search vendor "Juniper" for product "Acx500"	-	-	Safe
Juniper Search vendor "Juniper"	Junos Search vendor "Juniper" for product "Junos"	18.4 Search vendor "Juniper" for product "Junos" and version "18.4"	r3-s7	Affected	in	Juniper Search vendor "Juniper"	Acx5048 Search vendor "Juniper" for product "Acx5048"	-	-	Safe
Juniper Search vendor "Juniper"	Junos Search vendor "Juniper" for product "Junos"	18.4 Search vendor "Juniper" for product "Junos" and version "18.4"	r3-s7	Affected	in	Juniper Search vendor "Juniper"	Acx5096 Search vendor "Juniper" for product "Acx5096"	-	-	Safe