CVE-2024-21618 Information

Description

An Access of Memory Location After End of Buffer vulnerability in the Layer-2 Control Protocols Daemon (l2cpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause Denial of Service (DoS).

On all Junos OS and Junos OS Evolved platforms when LLDP is enabled on a specific interface and a malformed LLDP packet is received l2cpd crashes and restarts. The impact of the l2cpd crash is reinitialization of STP protocols (RSTP MSTP or VSTP) and MVRP and ERP. Also if any services depend on LLDP state (like PoE or VoIP device recognition) then these will also be affected.

This issue affects:

Junos OS: from 21.4 before 21.4R3-S4 

from 22.1 before 22.1R3-S4 

from 22.2 before 22.2R3-S2 

from 22.3 before 22.3R2-S2 22.3R3-S1 

from 22.4 before 22.4R3 

from 23.2 before 23.2R2.

Junos OS Evolved: from 21.4-EVO before 21.4R3-S5-EVO 

from 22.1-EVO before 22.1R3-S4-EVO 

from 22.2-EVO before 22.2R3-S2-EVO 

from 22.3-EVO before 22.3R2-S2-EVO 22.3R3-S1-EVO 

from 22.4-EVO before 22.4R3-EVO 

from 23.2-EVO before 23.2R2-EVO.

This issue does not affect: Junos OS versions prior to 21.4R1;

Junos OS Evolved versions prior to 21.4R1-EVO.

CVSS Vector

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

Reference

https://supportportal.juniper.net/JSA75759 https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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

6.5