CVE-2021-31361 Information

Description

An Improper Check for Unusual or Exceptional Conditions vulnerability combined with Improper Handling of Exceptional Conditions in Juniper Networks Junos OS on QFX Series and PTX Series allows an unauthenticated network based attacker to cause increased FPC CPU utilization by sending specific IP packets which are being VXLAN encapsulated leading to a partial Denial of Service (DoS). Continued receipted of these specific traffic will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS on QFX Series: All versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R2-S13 17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R2-S8 18.2R3-S7; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R1-S8 18.4R2-S7 18.4R3-S7; 19.1 versions prior to 19.1R1-S6 19.1R2-S2 19.1R3-S4; 19.2 versions prior to 19.2R1-S6 19.2R3-S2; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R2-S3 19.4R3-S1; 20.1 versions prior to 20.1R2 20.1R3; 20.2 versions prior to 20.2R2 20.2R3; 20.3 versions prior to 20.3R1-S1 20.3R2. Juniper Networks Junos OS on PTX Series: All versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R1-S7 19.2R3-S3; 19.3 versions prior to 19.3R2-S6 19.3R3-S3; 19.4 versions prior to 19.4R1-S4 19.4R3-S5; 20.1 versions prior to 20.1R2-S2 20.1R3; 20.2 versions prior to 20.2R3-S1; 20.3 versions prior to 20.3R2-S1 20.3R3; 20.4 versions prior to 20.4R2-S1 20.4R3; 21.1 versions prior to 21.1R1-S1 21.1R2.

CVSS Vector

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

Reference

https://kb.juniper.net/JSA11223

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

LOW

Base Severity

5.3