Executive Summary



This vulnerability is currently undergoing analysis and not all information is available. Please check back soon to view the completed vulnerability summary
Informations
Name CVE-2025-21594 First vendor Publication 2025-04-09
Vendor Cve Last vendor Modification 2025-04-09

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Overall CVSS Score 7.5
Base Score 7.5 Environmental Score 7.5
impact SubScore 3.6 Temporal Score 7.5
Exploitabality Sub Score 3.9
 
Attack Vector Network Attack Complexity Low
Privileges Required None User Interaction None
Scope Unchanged Confidentiality Impact None
Integrity Impact None Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score N/A Attack Range N/A
Cvss Impact Score N/A Attack Complexity N/A
Cvss Expoit Score N/A Authentication N/A
Calculate full CVSS 2.0 Vectors scores

Detail

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:Â

  user@host> show services nat source port-blockÂ
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:Â

* from 21.2 before 21.2R3-S8,Â
* from 21.4 before 21.4R3-S7,Â
* from 22.1 before 22.1R3-S6,Â
* from 22.2 before 22.2R3-S4,Â
* from 22.3 before 22.3R3-S3,Â
* from 22.4 before 22.4R3-S2,Â
* from 23.2 before 23.2R2-S1,Â
* from 23.4 before 23.4R1-S2, 23.4R2.

This issue does not affect versions before 20.2R1.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-21594

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-754 Improper Check for Unusual or Exceptional Conditions

Sources (Detail)

https://supportportal.juniper.net/JSA96449
Source Url

Alert History

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0
Date Informations
2025-05-27 02:52:08
  • First insertion