CVE-2021-31371 Information

Description

Juniper Networks Junos OS uses the 128.0.0.0/2 subnet for internal communications between the RE and PFEs. It was discovered that packets utilizing these IP addresses may egress an QFX5000 Series switch leaking configuration information such as heartbeats kernel versions etc. out to the Internet leading to an information exposure vulnerability. This issue affects Juniper Networks Junos OS on QFX5110 QFX5120 QFX5200 QFX5210 Series and QFX5100 with QFX 5e Series image installed: All versions prior to 17.3R3-S12; 18.1 versions prior to 18.1R3-S13; 18.3 versions prior to 18.3R3-S5; 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-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3-S1; 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:L/I:N/A:N

Reference

https://kb.juniper.net/JSA11236

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

NONE

Base Severity

5.3