CVE-2021-0236

Junos OS: A specific BGP VPNv6 flowspec message causes routing protocol daemon (rpd) process to crash with a core.

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Due to an improper check for unusual or exceptional conditions in Juniper Networks Junos OS and Junos OS Evolved the Routing Protocol Daemon (RPD) service, upon receipt of a specific matching BGP packet meeting a specific term in the flowspec configuration, crashes and restarts causing a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects only Multiprotocol BGP (MP-BGP) VPNv6 FlowSpec deployments. This issue affects: Juniper Networks Junos OS: 18.4 versions prior to 18.4R1-S8, 18.4R2-S7, 18.4R3-S7; 19.1 versions prior to 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R2-S4, 19.4R3-S1; 20.1 versions prior to 20.1R2, 20.1R3; 20.2 versions prior to 20.2R2, 20.2R3; 20.3 versions prior to 20.3R1-S1, 20.3R2. Juniper Networks Junos OS Evolved: All versions after 18.4R1-EVO prior to 20.3R2-EVO. This issue does not affect: Juniper Networks Junos OS versions prior to 18.4R1. Juniper Networks Junos OS Evolved versions prior to 18.4R1-EVO.

Debido a una comprobación inapropiada de condiciones inusuales o excepcionales en Juniper Networks Junos OS y Junos OS Evolved, el Routing Protocol Daemon (RPD), al recibir un paquete BGP específico que coincide con un término específico en la configuración de flowpec, se bloquea y se reinicia causando una Denegación de Servicio (DoS). La recepción y el procesamiento continuo de este paquete crearán una condición sostenida de Denegación de Servicio (DoS). Este problema afecta solo a las implementaciones Multiprotocol BGP (MP-BGP) VPNv6 FlowSpec. Este problema afecta a: Juniper Networks Junos OS: versiones 18.4 anteriores a 18.4R1-S8, 18.4R2-S7, 18.4R3-S7; versiones 19.1 anteriores a 19.1R2-S2, 19.1R3-S4; versiones 19.2 anteriores a 19.2R1-S6, 19.2R3-S2; versiones 19.3 anteriores a 19.3R3-S2; versiones 19.4 anteriores a 19.4R2-S4, 19.4R3-S1; versiones 20.1 anteriores a 20.1R2, 20.1R3; versiones 20.2 anteriores a 20.2R2, 20.2R3; versiones 20. 3 anteriores a 20.3R1-S1, 20.3R2. Juniper Networks Junos OS Evolved: todas las versiones posteriores a 18.4R1-EVO anteriores a 20.3R2-EVO. Este problema no afecta a: Juniper Networks Junos OS versiones anteriores a 18.4R1. Juniper Networks Junos OS Evolved versiones anteriores a 18.4R1-EVO

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Complete

* 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
2023-03-08 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-754: Improper Check for Unusual or Exceptional Conditions

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://kb.juniper.net/JSA11131	2021-04-27

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"		-		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r1-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r1-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r1-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r1-s5		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r1-s6		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r1-s7		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r2-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r2-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r2-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r2-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r2-s5		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r2-s6		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r3-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r3-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r3-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r3-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r3-s5		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r3-s6		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		-		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r1-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r1-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r1-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r1-s5		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r2-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r3-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r3-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r3-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		-		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		r1-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		r1-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		r1-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		r1-s5		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		r2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		r2-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		r3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		r3-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		-		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r2-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r2-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r2-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r2-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r2-s5		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.4 Search vendor "Juniper" for product "Junos" and version "19.4"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.4 Search vendor "Juniper" for product "Junos" and version "19.4"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.4 Search vendor "Juniper" for product "Junos" and version "19.4"		r1-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.4 Search vendor "Juniper" for product "Junos" and version "19.4"		r2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.4 Search vendor "Juniper" for product "Junos" and version "19.4"		r2-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.4 Search vendor "Juniper" for product "Junos" and version "19.4"		r2-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.4 Search vendor "Juniper" for product "Junos" and version "19.4"		r2-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.4 Search vendor "Juniper" for product "Junos" and version "19.4"		r3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.1 Search vendor "Juniper" for product "Junos" and version "20.1"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.1 Search vendor "Juniper" for product "Junos" and version "20.1"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.1 Search vendor "Juniper" for product "Junos" and version "20.1"		r1-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.1 Search vendor "Juniper" for product "Junos" and version "20.1"		r1-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.1 Search vendor "Juniper" for product "Junos" and version "20.1"		r1-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.2 Search vendor "Juniper" for product "Junos" and version "20.2"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.2 Search vendor "Juniper" for product "Junos" and version "20.2"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.2 Search vendor "Juniper" for product "Junos" and version "20.2"		r1-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.2 Search vendor "Juniper" for product "Junos" and version "20.2"		r1-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.3 Search vendor "Juniper" for product "Junos" and version "20.3"		r1		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				19.1 Search vendor "Juniper" for product "Junos Os Evolved" and version "19.1"		r1		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				19.1 Search vendor "Juniper" for product "Junos Os Evolved" and version "19.1"		r2		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				19.2 Search vendor "Juniper" for product "Junos Os Evolved" and version "19.2"		r1		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				19.2 Search vendor "Juniper" for product "Junos Os Evolved" and version "19.2"		r2		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				19.3 Search vendor "Juniper" for product "Junos Os Evolved" and version "19.3"		r1		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				19.3 Search vendor "Juniper" for product "Junos Os Evolved" and version "19.3"		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"		r1		Affected