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CVE-2021-0203— Junos OS: EX and QFX5K Series: Storm Control does not work as expected when Redundant Trunk Group is configured

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和Juniper Networks Junos OS QFX都是美国Juniper Networks公司的一款交换机。 Junos OS EX 和 Junos OS QFX5K 存在安全漏洞，攻击者可利用该漏洞通过风暴控制旁路触发一个致命错误，以触发拒绝服务。以下产品及版本受到影响：Juniper Networks Junos OS on EX Series and QFX5K Series: 15.1 versions prior to 15.1R

CVSS 8.6 · High EPSS 1.00% · P61

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-0203

Vulnerability Information
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Vulnerability Title
Junos OS: EX and QFX5K Series: Storm Control does not work as expected when Redundant Trunk Group is configured
Source: CVE Program / CVE List V5
Vulnerability Description
On Juniper Networks EX and QFX5K Series platforms configured with Redundant Trunk Group (RTG), Storm Control profile applied on the RTG interface might not take affect when it reaches the threshold condition. Storm Control enables the device to monitor traffic levels and to drop broadcast, multicast, and unknown unicast packets when a specified traffic level is exceeded, thus preventing packets from proliferating and degrading the LAN. Note: this issue does not affect EX2200, EX3300, EX4200, and EX9200 Series. This issue affects Juniper Networks Junos OS on EX Series and QFX5K Series: 15.1 versions prior to 15.1R7-S7; 16.1 versions prior to 16.1R7-S8; 17.2 versions prior to 17.2R3-S4; 17.3 versions prior to 17.3R3-S8; 17.4 versions prior to 17.4R2-S11, 17.4R3-S2; 18.1 versions prior to 18.1R3-S10; 18.2 versions prior to 18.2R3-S5; 18.3 versions prior to 18.3R2-S4, 18.3R3-S2; 18.4 versions prior to 18.4R2-S5, 18.4R3-S3; 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-S2, 20.1R2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对特殊元素的多个实例的过滤不完全
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS EX和 Junos OS QFX 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos OS EX和Juniper Networks Junos OS QFX都是美国Juniper Networks公司的一款交换机。 Junos OS EX 和 Junos OS QFX5K 存在安全漏洞，攻击者可利用该漏洞通过风暴控制旁路触发一个致命错误，以触发拒绝服务。以下产品及版本受到影响：Juniper Networks Junos OS on EX Series and QFX5K Series: 15.1 versions prior to 15.1R
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 15.1 ~ 15.1R7-S7 -

II. Public POCs for CVE-2021-0203

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III. Intelligence Information for CVE-2021-0203

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Vendor Advisories for CVE-2021-0203 (1)

Same Patch Batch · Juniper Networks · 2021-01-15 · 19 CVEs total

CVE-2021-0211 10.0 CRITICAL Junos OS and Junos OS Evolved: Upon receipt of a specific BGP FlowSpec message network tra
CVE-2021-0208 8.8 HIGH Junos OS and Junos OS Evolved: In bidirectional LSP configurations, on MPLS egress router
CVE-2021-0204 7.8 HIGH Junos OS: dexp Local Privilege Escalation vulnerabilities in SUID binaries
CVE-2021-0223 7.8 HIGH Junos OS: telnetd.real Local Privilege Escalation vulnerabilities in SUID binaries
CVE-2021-0218 7.8 HIGH Junos OS: Command injection vulnerability in license-check daemon
CVE-2021-0207 7.5 HIGH NFX250, NFX350, QFX5K Series, EX2300 Series, EX3400 Series, EX4300 Multigigabit, EX4600 Se
CVE-2021-0206 7.5 HIGH Junos OS: NFX Series, SRX Series: PFE may crash upon receipt of specific packet when SSL P
CVE-2021-0202 7.5 HIGH Junos OS: MX Series, EX9200 Series: Trio-based MPC memory leak when Integrated Routing and
CVE-2021-0217 7.4 HIGH Junos OS: EX Series and QFX Series: Memory leak issue processing specific DHCP packets
CVE-2021-0222 7.4 HIGH Junos OS: Upon receipt of certain protocol packets with invalid payloads a self-propagatin
CVE-2021-0210 6.8 MEDIUM Junos OS: Privilege escalation in J-Web due to arbitrary command and code execution via in
CVE-2021-0220 6.8 MEDIUM Junos Space: Shared secrets stored in recoverable format and directly exposed through the
CVE-2021-0219 6.7 MEDIUM Junos OS: Command injection vulnerability in 'request system software' CLI command
CVE-2021-0209 6.5 MEDIUM Junos OS Evolved: Receipt of certain valid BGP update packets from BGP peers may cause RPD
CVE-2021-0215 6.5 MEDIUM Junos OS: EX Series, QFX Series, SRX Branch Series, MX Series: Memory leak in packet forwa
CVE-2021-0221 6.5 MEDIUM Junos OS: QFX Series: Traffic loop Denial of Service (DoS) upon receipt of specific IP mul
CVE-2021-0205 5.8 MEDIUM Junos OS: MX Series: Dynamic filter fails to match IPv6 prefix
CVE-2021-0212 5.0 MEDIUM Contrail Networking: Administrator credentials are exposed in a plaintext file

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks
Same weakness: CWE-794

V. Comments for CVE-2021-0203

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