CVE-2024-39542

Summary

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 Software

VendorProductVersion RangeStatus
Juniper NetworksJunos OS0 < 21.2R3-S4affected
Juniper NetworksJunos OS21.4 < 21.4R2affected
Juniper NetworksJunos OS22.2 < 22.2R2-S1, 22.2R3affected
Juniper NetworksJunos OS Evolved0 < 21.2R3-S8-EVOaffected
Juniper NetworksJunos OS Evolved21.4 < 21.4R2-EVOaffected

Weaknesses

  • 1286 Improper Validation of Syntactic Correctness of Input

Workarounds

There are no known workarounds for this issue.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

CVE Program Container

Additional References

References