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.

The following software releases have been updated to resolve this specific issue:

Junos OS: 21.2R3-S9, 22.4R3-S7, 23.2R2-S3, 23.4R2-S4, 24.2R2, 24.4R1, and all subsequent releases.

Junos OS Evolved: 22.4R3-S7-EVO, 23.2R2-S3-EVO, 23.4R2-S4-EVO, 24.2R2-EVO, 24.4R1-EVO, and all subsequent releases.

This issue is being tracked as 1834075 which is visible on the Customer Support website.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

There are no known workarounds for this issue.

2025-07-09: Initial Publication

2025-07-11: Added Junos OS Evolved in affected and solution section

2025-07-30: Added workaround

2025-08-06: Rescored CVSS

2025-08-20: Rescored CVSS and removed workaround

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team
• https://www.cve.org/CVERecord?id=CVE-2025-52955