Juniper Junos OS: 2025-07 Security Bulletin: Junos OS and Junos OS Evolved: When jflow/sflow is configured continuous logical interface flaps causes rpd crash and restart (JSA100062) (CVE-2025-52955)

An Incorrect Calculation of Buffer Size vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause a memory corruption that leads to a rpd crash. 

When
the logical interface using a routing instance flaps continuously, specific updates are sent to the jflow/sflow modules. This results in memory corruption, leading to an rpd crash and restart. 

Continued receipt of these specific updates will cause a sustained Denial of Service condition.

This issue affects Junos OS:

* All versions before 21.2R3-S9,
* All versions of 21.4,
* All versions of 22.2,
* from 22.4 before 22.4R3-S7,
* 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 of 21.2-EVO, 
* All versions of 21.4-EVO, 
* All versions of 22.2-EVO, 
* from 22.4 before 22.4R3-S7-EVO, 
* from 23.2 before 23.2R2-S3-EVO, 
* from 23.4 before 23.4R2-S4-EVO, 
* from 24.2 before 24.2R2-EVO.