CVE-2025-52955: Junos OS and Junos OS Evolved: When jflow/sflow is configured continuous logical interface flaps causes rpd crash and restart
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.
Affected Software
Remediation
Information
Event History
Frequently Asked Questions
What is the severity of CVE-2025-52955?
CVE-2025-52955 has been classified as critical due to its potential to allow memory corruption and subsequent service disruption.
How do I fix CVE-2025-52955?
To mitigate CVE-2025-52955, upgrade your Junos OS to a version that addresses the vulnerability, specifically versions beyond 21.4 and 22.2.
What impact does CVE-2025-52955 have on my system?
CVE-2025-52955 can cause the routing protocol daemon to crash, impacting network availability for affected systems.
Who is affected by CVE-2025-52955?
CVE-2025-52955 affects installations of Juniper Networks Junos OS versions up to 21.2R3-S9, 21.4, and 22.2.
Can CVE-2025-52955 be exploited remotely?
Yes, CVE-2025-52955 can be exploited by adjacent unauthenticated attackers, making it a significant risk.