CVE-2024-39531 Information

Description

An Improper Handling of Values vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS Evolved on ACX 7000 Series allows a network-based unauthenticated attacker to cause a Denial-of-Service (DoS).

If a value is configured for DDoS bandwidth or burst parameters for any protocol in a queue all protocols which share the same queue will have their bandwidth or burst value changed to the new value. If for example OSPF was configured with a certain bandwidth value ISIS would also be limited to this value. So inadvertently either the control plane is open for a high level of specific traffic which was supposed to be limited to a lower value or the limit for a certain protocol is so low that chances to succeed with a volumetric DoS attack are significantly increased. 

This issue affects Junos OS Evolved on ACX 7000 Series:

All versions before 21.4R3-S7-EVO
22.1 versions before 22.1R3-S6-EVO 
22.2 versions before 22.2R3-S3-EVO
22.3 versions before 22.3R3-S3-EVO 
22.4 versions before 22.4R3-S2-EVO
23.2 versions before 23.2R2-EVO
23.4 

versions

before 23.4R1-S1-EVO 23.4R2-EVO.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://supportportal.juniper.net/JSA82991

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5