// For flags

CVE-2024-39542

Junos OS and Junos OS Evolved: A malformed CFM packet or specific transit traffic leads to FPC crash

Severity Score

8.7
*CVSS v4

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

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.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
System
Vulnerable | Subsequent
Confidentiality
None
None
Integrity
None
None
Availability
High
Low
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-06-25 CVE Reserved
  • 2024-07-11 CVE Published
  • 2024-07-12 EPSS Updated
  • 2024-08-02 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-1286: Improper Validation of Syntactic Correctness of Input
CAPEC
References (1)
URL Tag Source
URL Date SRC
URL Date SRC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Juniper Networks
Search vendor "Juniper Networks"
Junos OS
Search vendor "Juniper Networks" for product "Junos OS"
< 21.2R3-S4
Search vendor "Juniper Networks" for product "Junos OS" and version " < 21.2R3-S4"
en
Affected
Juniper Networks
Search vendor "Juniper Networks"
Junos OS
Search vendor "Juniper Networks" for product "Junos OS"
>= 21.4 < 21.4R2
Search vendor "Juniper Networks" for product "Junos OS" and version " >= 21.4 < 21.4R2"
en
Affected
Juniper Networks
Search vendor "Juniper Networks"
Junos OS
Search vendor "Juniper Networks" for product "Junos OS"
>= 22.2 < 22.2R2-S1
Search vendor "Juniper Networks" for product "Junos OS" and version " >= 22.2 < 22.2R2-S1"
en
Affected
Juniper Networks
Search vendor "Juniper Networks"
Junos OS
Search vendor "Juniper Networks" for product "Junos OS"
>= 22.2 < 22.2R3
Search vendor "Juniper Networks" for product "Junos OS" and version " >= 22.2 < 22.2R3"
en
Affected
Juniper Networks
Search vendor "Juniper Networks"
Junos OS Evolved
Search vendor "Juniper Networks" for product "Junos OS Evolved"
< 21.2R3-S8-EVO
Search vendor "Juniper Networks" for product "Junos OS Evolved" and version " < 21.2R3-S8-EVO"
en
Affected
Juniper Networks
Search vendor "Juniper Networks"
Junos OS Evolved
Search vendor "Juniper Networks" for product "Junos OS Evolved"
>= 21.4 < 21.4R2-EVO
Search vendor "Juniper Networks" for product "Junos OS Evolved" and version " >= 21.4 < 21.4R2-EVO"
en
Affected