CVE-2021-0287 Information

Description

In a Segment Routing ISIS (SR-ISIS)/MPLS environment on Juniper Networks Junos OS and Junos OS Evolved devices configured with ISIS Flexible Algorithm for Segment Routing and sensor-based statistics a flap of a ISIS link in the network can lead to a routing process daemon (RPD) crash and restart causing a Denial of Service (DoS). Continued link flaps will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS: 19.4 versions prior to 19.4R1-S4 19.4R3-S2; 20.1 versions prior to 20.1R2-S1 20.1R3; 20.2 versions prior to 20.2R2-S2 20.2R3; 20.3 versions prior to 20.3R2; Juniper Networks Junos OS Evolved: 20.3-EVO versions prior to 20.3R2-EVO; 20.4-EVO versions prior to 20.4R2-EVO. This issue does not affect: Juniper Networks Junos OS releases prior to 19.4R1. Juniper Networks Junos OS Evolved releases prior to 19.4R1-EVO.

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/JSA11189

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