CVE-2025-52952

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

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.

Remediation

Solution:

  • The following software releases have been updated to resolve these issues: Junos OS: 22.2R3-S1, 22.4R2, 23.2R1, and all subsequent releases.

Workaround:

  • There are no known workarounds for this issue.

Category

7.1
CVSS
Severity: High
CVSS 4.0 •
CVSS 3.1 •
Vendor Advisory juniper.net
Affected: Juniper Networks Junos OS
Published at:
Updated at:

References

Link Tags
https://supportportal.juniper.net/JSA100058 vendor advisory
https://www.juniper.net/documentation/us/en/software/junos/network-mgmt/topics/topic-map/cfm-configuring.html technical description

Frequently Asked Questions

What is the severity of CVE-2025-52952?
CVE-2025-52952 has been scored as a high severity vulnerability.
How to fix CVE-2025-52952?
To fix CVE-2025-52952: The following software releases have been updated to resolve these issues: Junos OS: 22.2R3-S1, 22.4R2, 23.2R1, and all subsequent releases.
Is CVE-2025-52952 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-52952 is being actively exploited.
What software or system is affected by CVE-2025-52952?
CVE-2025-52952 affects Juniper Networks Junos OS.
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