CVE-2024-39542

published 2024-07-11

CVE-2024-39542: An Improper Validation of Syntactic Correctness of Input vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on MX Series with…

Priority P3 47 high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I N A H

An Improper Validation of Syntactic Correctness of Input vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on MX Series with MPC10/11 or LC9600, MX304, and Junos OS Evolved on ACX Series and PTX Series allows an unauthenticated, network based attacker to cause a Denial-of-Service (DoS).

This issue can occur in two scenarios:

1. If a device, which is configured with SFLOW and ECMP, receives specific valid transit traffic, which is subject to sampling, the packetio process crashes, which in turn leads to an evo-aftman crash and causes the FPC to stop working until it is restarted. (This scenario is only applicable to PTX but not to ACX or MX.)

2. If a device receives a malformed CFM packet on an interface configured with CFM, the packetio process crashes, which in turn leads to an evo-aftman crash and causes the FPC to stop working until it is restarted. Please note that the CVSS score is for the formally more severe issue 1.

The CVSS score for scenario 2. is: 6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

This issue affects Junos OS:

* All versions before 21.2R3-S4,
* 21.4 versions before 21.4R2,
* 22.2 versions before 22.2R3-S2;

Junos OS Evolved:

* All versions before 21.2R3-S8-EVO,
* 21.4 versions before 21.4R2-EVO.

Affected

11 ranges

Vendor	Product	Version range	Fixed in
juniper	junos	—	—
juniper	junos	—	—
juniper	junos_os	—	—
juniper	junos_os_evolved	—	—
juniper	junos_os_evolved	—	—
juniper	mx_series	—	—
juniper_networks	junos_os	< 21.2R3-S4	21.2R3-S4
juniper_networks	junos_os	>= 21.4 < 21.4R2	21.4R2
juniper_networks	junos_os	>= 22.2 < 22.2R2-S1, 22.2R3	22.2R2-S1, 22.2R3
juniper_networks	junos_os_evolved	< 21.2R3-S8-EVO	21.2R3-S8-EVO
juniper_networks	junos_os_evolved	>= 21.4 < 21.4R2-EVO	21.4R2-EVO

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd v4.0 8.7 HIGH CVSS:4.0/AV:N/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:X/R:X/V:X/RE:X/U:X

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CWE-1286