CVE-2025-21602 Information

Description

An Improper Handling of Exceptional Conditions vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker sending a specific BGP update packet to cause rpd to crash and restart resulting in a Denial of Service (DoS).

Continuous receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.

This issue affects iBGP and eBGP and both IPv4 and IPv6 are affected by this vulnerability.

This issue affects Junos OS: 

from 21.4 before 21.4R3-S9 
from 22.2 before 22.2R3-S5 
from 22.3 before 22.3R3-S4
from 22.4 before 22.4R3-S5 
from 23.2 before 23.2R2-S3 
from 23.4 before 23.4R2-S3 
from 24.2 before 24.2R1-S2 24.2R2; 

This issue does not affect versions prior to 21.1R1.

Junos OS Evolved: 

from 21.4 before 21.4R3-S9-EVO 
from 22.2 before 22.2R3-S5-EVO 
from 22.3 before 22.3R3-S4-EVO
from 22.4 before 22.4R3-S5-EVO 
from 23.2 before 23.2R2-S3-EVO 
from 23.4 before 23.4R2-S3-EVO 
from 24.2 before 24.2R1-S2-EVO 24.2R2-EVO.

This issue does not affect versions prior to 21.1R1-EVO

CVSS Vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://supportportal.juniper.net/JSA92872

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

6.5