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CVE-2023-36849— Junos OS and Junos OS Evolved: The l2cpd will crash when a malformed LLDP packet is received

Quick assessment

Affected
Juniper Networks Junos OS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Juniper Networks Junos OS和Juniper Networks Junos OS Evolved都是美国瞻博网络（Juniper Networks）公司的产品。Juniper Networks Junos OS是一套专用于该公司的硬件设备的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。Juniper Networks Junos OS Evolved是Junos OS 的升级版系统。 Juniper Networks Junos OS和Junos OS Evolve

CVSS 6.5 · Medium EPSS 0.30% · P21
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I. Basic Information for CVE-2023-36849

Vulnerability Information
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Vulnerability Title
Junos OS and Junos OS Evolved: The l2cpd will crash when a malformed LLDP packet is received
Source: CVE Program / CVE List V5
Vulnerability Description
An Improper Check or Handling of Exceptional Conditions vulnerability in the Layer-2 control protocols daemon (l2cpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a Denial of Service (DoS). When a malformed LLDP packet is received, l2cpd will crash and restart. 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. Continued receipt of such packets will lead to a sustained Denial of Service. This issue affects: Juniper Networks Junos OS 21.4 versions prior to 21.4R3-S3; 22.1 versions prior to 22.1R3-S3; 22.2 versions prior to 22.2R2-S1, 22.2R3; 22.3 versions prior to 22.3R2. Juniper Networks Junos OS Evolved 21.4-EVO versions prior to 21.4R3-S2-EVO; 22.1-EVO versions prior to 22.1R3-S3-EVO; 22.2-EVO versions prior to 22.2R2-S1-EVO, 22.2R3-EVO; 22.3-EVO versions prior to 22.3R2-EVO.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对异常条件检查或处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS和Junos OS Evolved 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS和Juniper Networks Junos OS Evolved都是美国瞻博网络（Juniper Networks）公司的产品。Juniper Networks Junos OS是一套专用于该公司的硬件设备的网络操作系统。该操作系统提供了安全编程接口和Junos SDK。Juniper Networks Junos OS Evolved是Junos OS 的升级版系统。 Juniper Networks Junos OS和Junos OS Evolve
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Juniper Networks Junos OS 21.4 ~ 21.4R3-S3 -
Juniper Networks Junos OS Evolved 21.4 ~ 21.4R3-S2-EVO -

II. Public POCs for CVE-2023-36849

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III. Intelligence Information for CVE-2023-36849

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Other References for CVE-2023-36849 (1)

Same Patch Batch · Juniper Networks · 2023-07-14 · 12 CVEs total

CVE-2023-36835 7.5 HIGH Junos OS: QFX10000 Series: All traffic will be dropped after a specific valid IP packet ha
CVE-2023-28985 7.5 HIGH SRX Series and MX Series: An FPC core is observed when IDP is enabled on the device and a
CVE-2023-36832 7.5 HIGH Junos OS: MX Series: PFE crash upon receipt of specific packet destined to an AMS interfac
CVE-2023-36831 7.5 HIGH Junos OS: SRX Series: jbuf memory leak when SSL Proxy and UTM Web-Filtering is applied
CVE-2023-36850 6.5 MEDIUM Junos OS: MX Series: An MPC will crash upon receipt of a malformed CFM packet.
CVE-2023-36848 6.5 MEDIUM Junos OS: MX Series: The FPC will crash on receiving a malformed CFM packet
CVE-2023-36834 6.5 MEDIUM Junos OS: SRX 4600 and SRX 5000 Series: The receipt of specific genuine packets by SRXes c
CVE-2023-36833 6.5 MEDIUM Junos OS Evolved: PTX10001-36MR, and PTX10004, PTX10008, PTX10016 with LC1201/1202: The af
CVE-2023-36840 5.5 MEDIUM Junos OS and Junos OS Evolved: An rpd crash occurs when a specific L2VPN command is run
CVE-2023-36838 5.5 MEDIUM Junos OS: SRX Series: A flowd core occurs when running a low privileged CLI command
CVE-2023-36836 4.7 MEDIUM Junos OS and Junos OS Evolved: In a MoFRR scenario an rpd core may be observed when a low

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks
Same weakness: CWE-703

V. Comments for CVE-2023-36849

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