CVE-2024-21618: Junos OS and Junos OS Evolved: When LLDP is enabled and a malformed LLDP packet is received, l2cpd crashes
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.
Affected Software
Remediation
Information
Event History
Frequently Asked Questions
What is the severity of CVE-2024-21618?
CVE-2024-21618 has been classified with a High severity due to its potential to cause Denial of Service.
How do I fix CVE-2024-21618?
To mitigate CVE-2024-21618, users should upgrade to the appropriate patched versions of Junos OS and Junos OS Evolved.
Who is affected by CVE-2024-21618?
CVE-2024-21618 affects various versions of Juniper Networks Junos OS and Junos OS Evolved from versions prior to 21.4R3-S4 up to and including 23.2.
What type of vulnerability is CVE-2024-21618?
CVE-2024-21618 is an Access of Memory Location After End of Buffer vulnerability.
Can an attacker exploit CVE-2024-21618 remotely?
Yes, an attacker can exploit CVE-2024-21618 remotely as it allows adjacent, unauthenticated attackers to trigger the vulnerability.