CVE-2025-52946 Information

Jul 12, 2025 cve

Description

A Use After Free vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Juniper Networks Junos OS Evolved allows an attacker sending a BGP update with a specifically malformed AS PATH to cause rpd to crash resulting in a Denial of Service (DoS). Continuous receipt of the malformed AS PATH attribute will cause a sustained DoS condition.

On all Junos OS and Junos OS Evolved platforms the rpd process will crash and restart when a specifically malformed AS PATH is received within a BGP update and traceoptions are enabled.

This issue only affects systems with BGP traceoptions enabled and requires a BGP session to be already established. Systems without BGP traceoptions enabled are not impacted by this issue.

This issue affects:

 Junos OS:

All versions before 21.2R3-S9 
all versions of 21.4
from 22.2 before 22.2R3-S6 
from 22.4 before 22.4R3-S5 
from 23.2 before 23.2R2-S3 
from 23.4 before 23.4R2-S4 
from 24.2 before 24.2R2; 

Junos OS Evolved: 

All versions before 22.4R3-S5-EVO 
from 23.2-EVO before 23.2R2-S3-EVO 
from 23.4-EVO before 23.4R2-S4-EVO 
from 24.2-EVO before 24.2R2-EVO.

This is a more complete fix for previously published CVE-2024-39549 (JSA83011).

CVSS Vector

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

Reference

https://supportportal.juniper.net/JSA100050

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

7.5

CNNVD-202507-1650 (Published: 2025-07-11)

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