CVE-2024-21593

Junos OS: MX Series with MPC10, MPC11, LC9600, and MX304: A specific MPLS packet will cause a PFE crash

Severity Score

7.1

*CVSS v4

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

An Improper Check or Handling of Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS).

If an attacker sends a specific MPLS packet, which upon processing, causes an internal loop, that leads to a PFE crash and restart. Continued receipt of these packets leads to a sustained Denial of Service (DoS) condition.

Circuit cross-connect (CCC) needs to be configured on the device for it to be affected by this issue.

This issue only affects MX Series with MPC10, MPC11, LC9600, and MX304.

This issue affects:
Juniper Networks Junos OS
21.4 versions from 21.4R3 earlier than 21.4R3-S5;
22.2 versions from 22.2R2 earlier than 22.2R3-S2;
22.3 versions from 22.3R1 earlier than 22.3R2-S2;
22.3 versions from 22.3R3 earlier than 22.3R3-S1
22.4 versions from 22.4R1 earlier than 22.4R2-S2, 22.4R3;
23.2 versions earlier than 23.2R1-S1, 23.2R2.

Una vulnerabilidad de verificación o manejo inadecuado de condiciones excepcionales en el motor de reenvío de paquetes (PFE) de Juniper Networks Junos OS y Junos OS Evolved permite que un atacante adyacente no autenticado provoque una denegación de servicio (DoS). Si un atacante envía un paquete MPLS específico, que al procesarse, provoca un bucle interno, lo que provoca un bloqueo y reinicio del PFE. La recepción continua de estos paquetes conduce a una condición sostenida de Denegación de Servicio (DoS). La conexión cruzada de circuito (CCC) debe configurarse en el dispositivo para que se vea afectado por este problema. Este problema solo afecta a la serie MX con MPC10, MPC11, LC9600 y MX304. Este problema afecta a: Juniper Networks Junos OS 21.4 versiones desde 21.4R3 anteriores a 21.4R3-S5; Versiones 22.2 de 22.2R2 anteriores a 22.2R3-S2; Versiones 22.3 de 22.3R1 anteriores a 22.3R2-S2; Versiones 22.3 de 22.3R3 anteriores a 22.3R3-S1. Versiones 22.4 de 22.4R1 anteriores a 22.4R2-S2, 22.4R3; Versiones 23.2 anteriores a 23.2R1-S1, 23.2R2.

*Credits: N/A

Attack Vector

Adjacent

Attack Complexity

Low

Attack Requirements

None

Privileges Required

None

User Interaction

None

System

Vulnerable | Subsequent

Confidentiality

None

Integrity

None

Availability

High

Low

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2023-12-27 CVE Reserved
2024-04-12 CVE Published
2024-04-21 EPSS Updated
2024-08-01 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-703: Improper Check or Handling of Exceptional Conditions

CAPEC

References (2)

URL	Tag	Source
https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L	Technical Description

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://supportportal.juniper.net/JSA75732	2024-05-16

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Juniper Networks Search vendor "Juniper Networks"		Junos OS Search vendor "Juniper Networks" for product "Junos OS"				>= 21.4R3 < 21.4R3-S5 Search vendor "Juniper Networks" for product "Junos OS" and version " >= 21.4R3 < 21.4R3-S5"		en		Affected
Juniper Networks Search vendor "Juniper Networks"		Junos OS Search vendor "Juniper Networks" for product "Junos OS"				>= 22.2R2 < 22.2R3-S2 Search vendor "Juniper Networks" for product "Junos OS" and version " >= 22.2R2 < 22.2R3-S2"		en		Affected
Juniper Networks Search vendor "Juniper Networks"		Junos OS Search vendor "Juniper Networks" for product "Junos OS"				>= 22.3R1 < 22.3R2-S2 Search vendor "Juniper Networks" for product "Junos OS" and version " >= 22.3R1 < 22.3R2-S2"		en		Affected
Juniper Networks Search vendor "Juniper Networks"		Junos OS Search vendor "Juniper Networks" for product "Junos OS"				>= 22.3R3 < 22.3R3-S1 Search vendor "Juniper Networks" for product "Junos OS" and version " >= 22.3R3 < 22.3R3-S1"		en		Affected
Juniper Networks Search vendor "Juniper Networks"		Junos OS Search vendor "Juniper Networks" for product "Junos OS"				>= 22.4R1 < 22.4R2-S2 Search vendor "Juniper Networks" for product "Junos OS" and version " >= 22.4R1 < 22.4R2-S2"		en		Affected
Juniper Networks Search vendor "Juniper Networks"		Junos OS Search vendor "Juniper Networks" for product "Junos OS"				>= 22.4R1 < 22.4R3 Search vendor "Juniper Networks" for product "Junos OS" and version " >= 22.4R1 < 22.4R3"		en		Affected
Juniper Networks Search vendor "Juniper Networks"		Junos OS Search vendor "Juniper Networks" for product "Junos OS"				>= 23.2 < 23.2R1-S1 Search vendor "Juniper Networks" for product "Junos OS" and version " >= 23.2 < 23.2R1-S1"		en		Affected
Juniper Networks Search vendor "Juniper Networks"		Junos OS Search vendor "Juniper Networks" for product "Junos OS"				>= 23.2 < 23.2R2 Search vendor "Juniper Networks" for product "Junos OS" and version " >= 23.2 < 23.2R2"		en		Affected