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CVE-2021-0202— Junos OS: MX Series, EX9200 Series: Trio-based MPC memory leak when Integrated Routing and Bridging (IRB) interface is mapped to a VPLS instance or a Bridge-Domain

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 MX Series and EX9200 Series 存在资源管理错误漏洞，攻击者可利用该漏洞通过Junos OS MX EX的MPC IRB创建内存泄漏，以触发拒绝服务。以下产品及版本受到影响：Juniper Networks Junos OS on MX Series, EX9200 Series: 17.3R3-S8; 17.4R3-S2; 18.2R3-S4, 18.2R3-S5; 18.3R3-S2, 18.3R3-S3; 18.4 versions star

CVSS 7.5 · High EPSS 1.03% · P63
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I. Basic Information for CVE-2021-0202

Vulnerability Information
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Vulnerability Title
Junos OS: MX Series, EX9200 Series: Trio-based MPC memory leak when Integrated Routing and Bridging (IRB) interface is mapped to a VPLS instance or a Bridge-Domain
Source: CVE Program / CVE List V5
Vulnerability Description
On Juniper Networks MX Series and EX9200 Series platforms with Trio-based MPC (Modular Port Concentrator) where Integrated Routing and Bridging (IRB) interface is configured and it is mapped to a VPLS instance or a Bridge-Domain, certain network events at Customer Edge (CE) device may cause memory leak in the MPC which can cause an out of memory and MPC restarts. When this issue occurs, there will be temporary traffic interruption until the MPC is restored. An administrator can use the following CLI command to monitor the status of memory usage level of the MPC: user@device> show system resource-monitor fpc FPC Resource Usage Summary Free Heap Mem Watermark : 20 % Free NH Mem Watermark : 20 % Free Filter Mem Watermark : 20 % * - Watermark reached Slot # % Heap Free RTT Average RTT 1 87 PFE # % ENCAP mem Free % NH mem Free % FW mem Free 0 NA 88 99 1 NA 89 99 When the issue is occurring, the value of “% NH mem Free” will go down until the MPC restarts. This issue affects MX Series and EX9200 Series with Trio-based PFEs (Packet Forwarding Engines). Please refer to https://kb.juniper.net/KB25385 for the list of Trio-based PFEs. This issue affects Juniper Networks Junos OS on MX Series, EX9200 Series: 17.3R3-S8; 17.4R3-S2; 18.2R3-S4, 18.2R3-S5; 18.3R3-S2, 18.3R3-S3; 18.4 versions starting from 18.4R3-S1 and later versions prior to 18.4R3-S6; 19.2 versions starting from 19.2R2 and later versions prior to 19.2R3-S1; 19.4 versions starting from 19.4R2 and later versions prior to 19.4R2-S3, 19.4R3; 20.2 versions starting from 20.2R1 and later versions prior to 20.2R1-S3, 20.2R2. This issue does not affect Juniper Networks Junos OS: 18.1, 19.1, 19.3, 20.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/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 MX Series and EX9200 Series 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks MX Series and EX9200 Series 存在资源管理错误漏洞，攻击者可利用该漏洞通过Junos OS MX EX的MPC IRB创建内存泄漏，以触发拒绝服务。以下产品及版本受到影响：Juniper Networks Junos OS on MX Series, EX9200 Series: 17.3R3-S8; 17.4R3-S2; 18.2R3-S4, 18.2R3-S5; 18.3R3-S2, 18.3R3-S3; 18.4 versions star
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 17.3R3-S8 -

II. Public POCs for CVE-2021-0202

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III. Intelligence Information for CVE-2021-0202

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Vendor Advisories for CVE-2021-0202 (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-2021-0203 8.6 HIGH Junos OS: EX and QFX5K Series: Storm Control does not work as expected when Redundant Trun
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-2021-0217 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-400

V. Comments for CVE-2021-0202

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