CVE-2021-0226

Junos OS Evolved: The IPv6 BGP session will flap due to receipt of a specific IPv6 packet

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

On Juniper Networks Junos OS Evolved devices, receipt of a specific IPv6 packet may cause an established IPv6 BGP session to terminate, creating a Denial of Service (DoS) condition. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue does not affect IPv4 BGP sessions. This issue affects IBGP or EBGP peer sessions with IPv6. This issue affects: Juniper Networks Junos OS Evolved: 19.4 versions prior to 19.4R2-S3-EVO; 20.1 versions prior to 20.1R2-S3-EVO; 20.2 versions prior to 20.2R2-S1-EVO; 20.3 versions prior to 20.3R2-EVO. This issue does not affect Juniper Networks Junos OS releases.

En los dispositivos Junos OS Evolved de Juniper Networks, la recepción de un paquete IPv6 específico puede causar la finalización de una sesión BGP IPv6 establecida, creando una condición de Denegación de Servicio (DoS). La recepción y el procesamiento continuo de este paquete creará una condición sostenida de Denegación de Servicio (DoS). Este problema no afecta a las sesiones de IPv4 BGP. Este problema afecta a las sesiones de peer IBGP o EBGP con IPv6. Este problema afecta a: Juniper Networks Junos OS Evolved: versiones 19.4 anteriores a 19.4R2-S3-EVO; versiones 20.1 anteriores a 20.1R2-S3-EVO; versiones 20.2 anteriores a 20.2R2-S1-EVO; versiones 20.3 anteriores a 20.3R2-EVO. Este problema no afecta versiones Juniper Networks Junos OS

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

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

2020-10-27 CVE Reserved
2021-04-22 CVE Published
2024-01-06 EPSS Updated
2024-09-17 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-665: Improper Initialization

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://kb.juniper.net/JSA11121	2021-10-07

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 Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				20.1 Search vendor "Juniper" for product "Junos Os Evolved" and version "20.1"		r1		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				20.1 Search vendor "Juniper" for product "Junos Os Evolved" and version "20.1"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				20.1 Search vendor "Juniper" for product "Junos Os Evolved" and version "20.1"		r2		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				20.1 Search vendor "Juniper" for product "Junos Os Evolved" and version "20.1"		r2-s1		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				20.1 Search vendor "Juniper" for product "Junos Os Evolved" and version "20.1"		r2-s2		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				20.2 Search vendor "Juniper" for product "Junos Os Evolved" and version "20.2"		r1		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				20.2 Search vendor "Juniper" for product "Junos Os Evolved" and version "20.2"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				20.2 Search vendor "Juniper" for product "Junos Os Evolved" and version "20.2"		r2		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				20.3 Search vendor "Juniper" for product "Junos Os Evolved" and version "20.3"		r1		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				20.3 Search vendor "Juniper" for product "Junos Os Evolved" and version "20.3"		r1-s1		Affected