Juniper Junos OS/Junos OS Evolved l2cpd access of memory location after end of buffer

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.3	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Juniper Junos OS and Junos OS Evolved. This issue affects some unknown processing of the component l2cpd. Such manipulation leads to access of memory location after end of buffer. This vulnerability is listed as CVE-2024-21618. The attack must be carried out from within the local network. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Juniper Junos OS and Junos OS Evolved (affected version not known) and classified as critical. Affected by this issue is some unknown functionality of the component l2cpd. The manipulation with an unknown input leads to a access of memory location after end of buffer vulnerability. Using CWE to declare the problem leads to CWE-788. The product reads or writes to a buffer using an index or pointer that references a memory location after the end of the buffer. Impacted is availability. CVE summarizes:

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.

The advisory is shared for download at supportportal.juniper.net. This vulnerability is handled as CVE-2024-21618 since 12/27/2023. The exploitation is known to be easy. The attack can only be initiated within the local network. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

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Productinfo

Type

Router Operating System

Vendor

Juniper

Name

License

commercial

Website

Vendor: https://www.juniper.net/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔍
CNA CVSS-BT Score: 🔍
CNA Vector: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.3

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (Juniper Networks, Inc.): 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Access of memory location after end of buffer
CWE: CWE-788 / CWE-120 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/27/2023 🔍
04/12/2024 +106 days 🔍
04/12/2024 +0 days 🔍
02/07/2025 +300 days 🔍

Sourcesinfo

Vendor: juniper.net

Advisory: JSA75759
Status: Confirmed

CVE: CVE-2024-21618 (🔍)
GCVE (CVE): GCVE-0-2024-21618
GCVE (VulDB): GCVE-100-260528

Entryinfo

Created: 04/12/2024 17:28
Updated: 02/07/2025 00:20
Changes: 04/12/2024 17:28 (61), 04/12/2024 17:29 (1), 05/22/2024 08:24 (1), 02/07/2025 00:20 (14)
Complete: 🔍
Cache ID: 216::103