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
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.
Affected Software
Remediation
Information
Event History
Frequently Asked Questions
What is the severity of CVE-2025-52952?
The severity of CVE-2025-52952 is considered critical due to the potential for an unauthenticated adjacent attacker to exploit the vulnerability.
How do I fix CVE-2025-52952?
To fix CVE-2025-52952, it is recommended to upgrade Junos OS to a version that includes the security patch addressing this vulnerability.
What devices are affected by CVE-2025-52952?
CVE-2025-52952 affects Juniper Networks Junos OS on MX Series with MPC1 through MPC9 line cards.
What kind of attack is possible with CVE-2025-52952?
CVE-2025-52952 allows an unauthenticated adjacent attacker to send a malformed packet, potentially leading to a system crash.
When was CVE-2025-52952 published?
CVE-2025-52952 was published in 2025 and is relevant to vulnerabilities found in Juniper Networks software.