CVE-2021-31351 Information

Description

An Improper Check for Unusual or Exceptional Conditions in packet processing on the MS-MPC/MS-MIC utilized by Juniper Networks Junos OS allows a malicious attacker to send a specific packet triggering the MS-MPC/MS-MIC to reset causing a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects specific versions of Juniper Networks Junos OS on MX Series: 17.3R3-S11; 17.4R2-S13; 17.4R3 prior to 17.4R3-S5; 18.1R3-S12; 18.2R2-S8 18.2R3-S7 18.2R3-S8; 18.3R3-S4; 18.4R3-S7; 19.1R3-S4 19.1R3-S5; 19.2R1-S6; 19.3R3-S2; 19.4R2-S4 19.4R2-S5; 19.4R3-S2; 20.1R2-S1; 20.2R2-S2 20.2R2-S3 20.2R3; 20.3R2 20.3R2-S1; 20.4R1 20.4R1-S1 20.4R2; 21.1R1; This issue does not affect any version of Juniper Networks Junos OS prior to 15.1X49-D240;

CVSS Vector

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

Reference

https://kb.juniper.net/JSA11216

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

7.5