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CVE-2020-1687— Junos OS: EX4300-MP/EX4600/QFX5K Series: High CPU load due to receipt of specific layer 2 frames in EVPN-VXLAN deployment.

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 EX/QFX是美国瞻博网络（Juniper Networks）公司的一款交换机。该产品为接入交换机的任意两个网络节点提供独享的电信号通路。 Junos OS EX/QFX存在安全漏洞，攻击者可利用该漏洞通过EVPN-VXLAN触发致命错误，以触发拒绝服务。

CVSS 6.5 · Medium EPSS 0.50% · P42

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service
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I. Basic Information for CVE-2020-1687

Vulnerability Information
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Vulnerability Title
Junos OS: EX4300-MP/EX4600/QFX5K Series: High CPU load due to receipt of specific layer 2 frames in EVPN-VXLAN deployment.
Source: CVE Program / CVE List V5
Vulnerability Description
On Juniper Networks EX4300-MP Series, EX4600 Series and QFX5K Series deployed in (Ethernet VPN) EVPN-(Virtual Extensible LAN) VXLAN configuration, receipt of a stream of specific VXLAN encapsulated layer 2 frames can cause high CPU load, which could lead to network protocol operation issue and traffic interruption. This issue affects devices that are configured as a Layer 2 or Layer 3 gateway of an EVPN-VXLAN deployment. The offending layer 2 frames that cause the issue originate from a different access switch that get encapsulated within the same EVPN-VXLAN domain. This issue affects Juniper Networks Junos OS on EX4300-MP Series, EX4600 Series and QFX5K Series: 17.3 versions prior to 17.3R3-S9; 17.4 versions prior to 17.4R2-S11, 17.4R3-S2, 17.4R3-S3; 18.1 versions prior to 18.1R3-S11; 18.2 versions prior to 18.2R3-S5; 18.3 versions prior to 18.3R2-S4, 18.3R3-S3; 18.4 versions prior to 18.4R2-S5, 18.4R3-S4; 19.1 versions prior to 19.1R2-S2, 19.1R3-S2; 19.2 versions prior to 19.2R1-S5, 19.2R2-S1, 19.2R3; 19.3 versions prior to 19.3R2-S4, 19.3R3; 19.4 versions prior to 19.4R1-S3, 19.4R2-S1, 19.4R3; 20.1 versions prior to 20.1R1-S3, 20.1R2.
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
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS EX/QFX 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS EX/QFX是美国瞻博网络（Juniper Networks）公司的一款交换机。该产品为接入交换机的任意两个网络节点提供独享的电信号通路。 Junos OS EX/QFX存在安全漏洞，攻击者可利用该漏洞通过EVPN-VXLAN触发致命错误，以触发拒绝服务。
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 17.3 ~ 17.3R3-S9 -

II. Public POCs for CVE-2020-1687

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III. Intelligence Information for CVE-2020-1687

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Vendor Advisories for CVE-2020-1687 (1)

Same Patch Batch · Juniper Networks · 2020-10-16 · 30 CVEs total

CVE-2020-1656 8.8 HIGH Junos OS: When a DHCPv6 Relay-Agent is configured upon receipt of a specific DHCPv6 client
CVE-2020-1673 8.8 HIGH Junos OS: Reflected Cross-site Scripting vulnerability in J-Web and web based (HTTP/HTTPS)
CVE-2020-1660 8.3 HIGH Junos OS: MX Series: Receipt of specific packets can cause services card to restart when D
CVE-2020-1667 8.3 HIGH Junos OS: MX Series: Services card might restart due to a race condition when DNS filterin
CVE-2020-1675 8.3 HIGH Juniper Networks Mist Cloud UI: SAML authentication certificate vulnerability.
CVE-2020-1664 7.8 HIGH Junos OS: Buffer overflow vulnerability in device control daemon
CVE-2020-1657 7.5 HIGH Junos OS: SRX Series: An attacker sending spoofed packets to IPSec peers may cause a Denia
CVE-2020-1686 7.5 HIGH Junos OS: Kernel crash (vmcore) upon receipt of a malformed IPv6 packet.
CVE-2020-1684 7.5 HIGH Junos OS: SRX Series: High CPU load due to processing for HTTP traffic when Application Id
CVE-2020-1683 7.5 HIGH Junos OS: Memory leak leads to kernel crash (vmcore) due to SNMP polling
CVE-2020-1679 7.5 HIGH Junos OS: PTX/QFX Series: Kernel Routing Table (KRT) queue stuck after packet sampling a m
CVE-2020-1672 7.5 HIGH Junos OS: jdhcpd process crash when processing a specific DHCPDv6 packet in DHCPv6 relay c
CVE-2020-1671 7.5 HIGH Junos OS: Receipt of malformed DHCPv6 packets causes jdhcpd to crash.
CVE-2020-1662 7.5 HIGH Junos OS and Junos OS Evolved: RPD crash due to BGP session flapping.
CVE-2020-1676 7.2 HIGH Juniper Networks Mist Cloud UI: SAML authentication response handling vulnerability.
CVE-2020-1677 7.2 HIGH Juniper Networks Mist Cloud UI: SAML authentication attribute elements handling vulnerabil
CVE-2020-1666 6.6 MEDIUM Junos OS Evolved: 'console log-out-on-disconnect' fails to terminate session on console ca
CVE-2020-1670 6.5 MEDIUM Junos OS: EX4300 Series: High CPU load due to receipt of specific IPv4 packets
CVE-2020-1689 6.5 MEDIUM Junos OS: EX4300-MP/EX4600/QFX5K Series: High CPU load due to receipt of specific layer 2
CVE-2020-1688 6.5 MEDIUM Junos OS: SRX and NFX Series: Insufficient Web API private key protection

Showing top 20 of 30 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks
Same weakness: CWE-400

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