CVE-2021-31353

Junos OS and Junos OS Evolved: RPD core upon receipt of specific BGP update

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 Handling of Exceptional Conditions vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows an attacker to inject a specific BGP update, causing the routing protocol daemon (RPD) to crash and restart, leading to a Denial of Service (DoS). Continued receipt and processing of the BGP update will create a sustained Denial of Service (DoS) condition. This issue affects very specific versions of Juniper Networks Junos OS: 19.3R3-S2; 19.4R3-S3; 20.2 versions 20.2R2-S3 and later, prior to 20.2R3-S2; 20.3 versions 20.3R2 and later, prior to 20.3R3; 20.4 versions 20.4R2 and later, prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS 20.1 is not affected by this issue. This issue also affects Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO versions prior to 21.1R2-EVO; 21.2-EVO versions prior to 21.2R2-EVO.

Una vulnerabilidad de administración inapropiada de condiciones excepcionales en Juniper Networks Junos OS y Junos OS Evolved permite a un atacante inyectar una actualización BGP específica, causando el bloqueo y el reinicio del demonio del protocolo de enrutamiento (RPD), conllevando a una Denegación de Servicio (DoS). Si se sigue recibiendo y procesando la actualización BGP, será creada una condición de Denegación de Servicio (DoS) sostenida. Este problema afecta a versiones muy específicas de Juniper Networks Junos OS: 19.3R3-S2; 19.4R3-S3; 20.2 versiones 20.2R2-S3 y posteriores, anteriores a 20.2R3-S2; 20.3 versiones 20.3R2 y posteriores, anteriores a 20.3R3; 20.4 versiones 20.4R2 y posteriores, anteriores a 20.4R3; versiones 21.1 anteriores a 21.1R2. Juniper Networks Junos OS 20.1 no está afectado por este problema. Este problema también afecta a Juniper Networks Junos OS Evolved: Todas las versiones anteriores a 20.4R2-S3-EVO, 20.4R3-EVO; 21.1-EVO versiones anteriores a 21.1R2-EVO; 21.2-EVO versiones anteriores a 21.2R2-EVO

*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
2024-09-16 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-755: Improper Handling of Exceptional Conditions

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC
https://kb.juniper.net/JSA11218	2024-09-16

URL	Date	SRC

URL	Date	SRC

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"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r3-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"		r3-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.2 Search vendor "Juniper" for product "Junos" and version "20.2"		r2-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.2 Search vendor "Juniper" for product "Junos" and version "20.2"		r3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.2 Search vendor "Juniper" for product "Junos" and version "20.2"		r3-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.3 Search vendor "Juniper" for product "Junos" and version "20.3"		r2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.3 Search vendor "Juniper" for product "Junos" and version "20.3"		r2-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.4 Search vendor "Juniper" for product "Junos" and version "20.4"		r2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.4 Search vendor "Juniper" for product "Junos" and version "20.4"		r2-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				21.1 Search vendor "Juniper" for product "Junos" and version "21.1"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				21.1 Search vendor "Juniper" for product "Junos" and version "21.1"		r1-s1		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"		-		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				20.4 Search vendor "Juniper" for product "Junos Os Evolved" and version "20.4"		r1		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				20.4 Search vendor "Juniper" for product "Junos Os Evolved" and version "20.4"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				20.4 Search vendor "Juniper" for product "Junos Os Evolved" and version "20.4"		r1-s2		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				20.4 Search vendor "Juniper" for product "Junos Os Evolved" and version "20.4"		r2		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				20.4 Search vendor "Juniper" for product "Junos Os Evolved" and version "20.4"		r2-s1		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				20.4 Search vendor "Juniper" for product "Junos Os Evolved" and version "20.4"		r2-s2		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				21.1 Search vendor "Juniper" for product "Junos Os Evolved" and version "21.1"		r1		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				21.1 Search vendor "Juniper" for product "Junos Os Evolved" and version "21.1"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				21.2 Search vendor "Juniper" for product "Junos Os Evolved" and version "21.2"		r1		Affected
Juniper Search vendor "Juniper"		Junos Os Evolved Search vendor "Juniper" for product "Junos Os Evolved"				21.2 Search vendor "Juniper" for product "Junos Os Evolved" and version "21.2"		r1-s1		Affected