PT-2021-19269 · Juniper Networks · Junos

Published 2021-10-19 · Updated 2021-10-25 · CVE-2021-31370

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Juniper Networks Junos OS on QFX5000 and EX4600 Series versions prior to 17.3R3-S12 Juniper Networks Junos OS on QFX5000 and EX4600 Series 17.4 versions prior to 17.4R3-S5 Juniper Networks Junos OS on QFX5000 and EX4600 Series 18.3 versions prior to 18.3R3-S5 Juniper Networks Junos OS on QFX5000 and EX4600 Series 18.4 versions prior to 18.4R3-S9 Juniper Networks Junos OS on QFX5000 and EX4600 Series 19.1 versions prior to 19.1R3-S6 Juniper Networks Junos OS on QFX5000 and EX4600 Series 19.2 versions prior to 19.2R1-S7, 19.2R3-S3 Juniper Networks Junos OS on QFX5000 and EX4600 Series 19.3 versions prior to 19.3R2-S6, 19.3R3-S3 Juniper Networks Junos OS on QFX5000 and EX4600 Series 19.4 versions prior to 19.4R1-S4, 19.4R3-S3 Juniper Networks Junos OS on QFX5000 and EX4600 Series 20.1 versions prior to 20.1R2-S2, 20.1R3-S1 Juniper Networks Junos OS on QFX5000 and EX4600 Series 20.2 versions prior to 20.2R3-S2 Juniper Networks Junos OS on QFX5000 and EX4600 Series 20.3 versions prior to 20.3R3 Juniper Networks Junos OS on QFX5000 and EX4600 Series 20.4 versions prior to 20.4R2-S2, 20.4R3 Juniper Networks Junos OS on QFX5000 and EX4600 Series 21.1 versions prior to 21.1R1-S1, 21.1R2

Description An Incomplete List of Disallowed Inputs vulnerability in Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on QFX5000 Series and EX4600 Series allows an adjacent unauthenticated attacker which sends a high rate of specific multicast traffic to cause control traffic received from the network to be dropped. This will impact control protocols (including but not limited to routing-protocols) and lead to a Denial of Service (DoS). Continued receipt of this specific multicast traffic will create a sustained Denial of Service (DoS) condition.

Recommendations For versions prior to 17.3R3-S12, update to 17.3R3-S12 or later. For 17.4 versions prior to 17.4R3-S5, update to 17.4R3-S5 or later. For 18.3 versions prior to 18.3R3-S5, update to 18.3R3-S5 or later. For 18.4 versions prior to 18.4R3-S9, update to 18.4R3-S9 or later. For 19.1 versions prior to 19.1R3-S6, update to 19.1R3-S6 or later. For 19.2 versions prior to 19.2R1-S7, 19.2R3-S3, update to 19.2R1-S7, 19.2R3-S3 or later. For 19.3 versions prior to 19.3R2-S6, 19.3R3-S3, update to 19.3R2-S6, 19.3R3-S3 or later. For 19.4 versions prior to 19.4R1-S4, 19.4R3-S3, update to 19.4R1-S4, 19.4R3-S3 or later. For 20.1 versions prior to 20.1R2-S2, 20.1R3-S1, update to 20.1R2-S2, 20.1R3-S1 or later. For 20.2 versions prior to 20.2R3-S2, update to 20.2R3-S2 or later. For 20.3 versions prior to 20.3R3, update to 20.3R3 or later. For 20.4 versions prior to 20.4R2-S2, 20.4R3, update to 20.4R2-S2, 20.4R3 or later. For 21.1 versions prior to 21.1R1-S1, 21.1R2, update to 21.1R1-S1, 21.1R2 or later.

Fix

DoS

Incomplete List of Disallowed Inputs

Weakness Enumeration

CWE-184

Related Identifiers

CVE-2021-31370

Affected Products

Junos

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2021-31370 · Security Note
• https://kb.juniper.net/JSA11232 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-31370 · Vendor Advisory
• https://t.me/cibsecurity/30814 · Telegram Post