CVE-2025-21594

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-21594
An Improper Check for Unusual or Exceptional Conditions vulnerability in the pfe (packet forwarding engine) of Juniper Networks Junos OS on MX Series causes a port within a pool to be blocked leading to Denial of Service (DoS). In a DS-Lite (Dual-Stack Lite) and NAT (Network Address Translation) scenario, when crafted IPv6 traffic is received and prefix-length is set to 56, the ports assigned to the user will not be freed.  Eventually, users cannot establish new connections. Affected FPC/PIC need to be manually restarted to recover. Following is the command to identify the issue:      user@host> show services nat source port-block      Host_IP                     External_IP                   Port_Block      Ports_Used/       Block_State/                                                               Range           Ports_Total       Left_Time(s)     2001::                        x.x.x.x                     58880-59391     256/256*1         Active/-       >>>>>>>>port still usedThis issue affects Junos OS on MX Series:  * from 21.2 before 21.2R3-S8,  * from 21.4 before 21.4R3-S7,  * from 22.1 before 22.1R3-S6,  * from 22.2 before 22.2R3-S4,  * from 22.3 before 22.3R3-S3,  * from 22.4 before 22.4R3-S2,  * from 23.2 before 23.2R2-S1,  * from 23.4 before 23.4R1-S2, 23.4R2. This issue does not affect versions before 20.2R1.

7.5 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://supportportal.juniper.net/JSA96449
Configurations

No configuration.

History

11 Apr 2025, 15:40

Type Values Removed Values Added
Summary
  • (es) Una vulnerabilidad de Comprobación Incorrecta de Condiciones Inusuales o Excepcionales en el motor de reenvío de paquetes (pfe) de Juniper Networks Junos OS en la serie MX provoca el bloqueo de un puerto dentro de un pool, lo que provoca una denegación de servicio (DoS). En un escenario de DS-Lite (Dual-Stack Lite) y NAT (Traducción de Direcciones de Red), al recibir tráfico IPv6 manipulado y con una longitud de prefijo de 56, los puertos asignados al usuario no se liberan. Finalmente, los usuarios no pueden establecer nuevas conexiones. El FPC/PIC afectado debe reiniciarse manualmente para recuperarse. A continuación se muestra el comando para identificar el problema: user@host> show services nat source port-block ????Host_IP External_IP Port_Block Ports_Used/ Block_State/ Range Ports_Total Left_Time(s) ????2001:: x.x.x.x 58880-59391 256/256*1 Active/- >>>>>>>>port still used Este problema afecta a Junos OS en la serie MX: * desde 21.2 antes de 21.2R3-S8, * desde 21.4 antes de 21.4R3-S7, * desde 22.1 antes de 22.1R3-S6, * desde 22.2 antes de 22.2R3-S4, * desde 22.3 antes de 22.3R3-S3, * desde 22.4 antes de 22.4R3-S2, * desde 23.2 antes de 23.2R2-S1, * desde 23.4 anteriores a 23.4R1-S2 y 23.4R2. Este problema no afecta a las versiones anteriores a 20.2R1.

09 Apr 2025, 20:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-04-09 20:15

Updated : 2025-04-11 15:40

NVD link : CVE-2025-21594

Mitre link : CVE-2025-21594

CVE.ORG link : CVE-2025-21594

JSON object : View

Products Affected

No product.

CWE
CWE-754

Improper Check for Unusual or Exceptional Conditions