CVE-2025-52952CWE-787

Junos OS: MX Series with MPC-BUILTIN, MPC 1 through MPC 9: Receipt and processing of a malformed packet causes one or more FPCs to crash

High · published July 11, 2025

CVSS v4.0
7.1
EPSS
0%
Percentile
22.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
7.1 · HIGH
Vector
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Green
EPSS
0.00310 · 22.7th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2025-07-11T15:04Z
EPSS history
Timeline
  • 11 JUL 15:04Z
    Junos OS: MX Series with MPC-BUILTIN, MPC 1 through MPC 9: Receipt and processing of a malformed packet causes one or more FPCs to crash
    cvelistv5