CVE-2021-0221 Information

Description

In an EVPN/VXLAN scenario if an IRB interface with a virtual gateway address (VGA) is configured on a PE a traffic loop may occur upon receipt of specific IP multicast traffic. The traffic loop will cause interface traffic to increase abnormally ultimately leading to a Denial of Service (DoS) in packet processing. The following command could be used to monitor the interface traffic: user@junos> monitor interface traffic Interface Link Input packets (pps) Output packets (pps) et-0/0/1 Up 6492089274364 (70994959) 6492089235319 (70994956) et-0/0/25 Up 343458103 (1) 156844 (0) ae0 Up 9132519197257 (70994959) 9132519139454 (70994956) This issue affects Juniper Networks Junos OS on QFX Series: all versions prior to 17.3R3-S10; 17.4 versions prior to 17.4R2-S12 17.4R3-S3; 18.1 versions prior to 18.1R3-S11; 18.2 versions prior to 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R2-S5 18.4R3-S5; 19.1 versions prior to 19.1R1-S6 19.1R2-S2 19.1R3-S3; 19.2 versions prior to 19.2R1-S5 19.2R3-S1; 19.3 versions prior to 19.3R2-S5 19.3R3; 19.4 versions prior to 19.4R2-S2 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R1-S2 20.2R2.

CVSS Vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://kb.juniper.net/JSA11111

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

6.5