CVE-2025-52952 – Juniper Networks Junos OS CFM Daemon Out-of-Bounds Write Vulnerability

The following table lists the changes that have been made to the
CVE-2025-52952 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by [email protected]

    Jul. 11, 2025

    Action Type Old Value New Value
    Added Description An Out-of-bounds Write vulnerability in the connectivity fault management (CFM) daemon of Juniper Networks Junos OS on MX Series with MPC-BUILTIN, MPC1 through MPC9 line cards allows an unauthenticated adjacent attacker to send a malformed packet to the device, leading to an FPC crash and restart, resulting in a Denial of Service (DoS).

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

    This issue affects Juniper Networks:
    Junos OS:
    * All versions before 22.2R3-S1,
    * from 22.4 before 22.4R2.

    This feature is not enabled by default.

    Added CVSS V4.0 AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:A/V:C/RE:M/U:Green
    Added CVSS V3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Added CWE CWE-787
    Added Reference https://supportportal.juniper.net/JSA100058
    Added Reference https://www.juniper.net/documentation/us/en/software/junos/network-mgmt/topics/topic-map/cfm-configuring.html
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