Improper Check for Unusual or Exceptional Conditions in Juniper Networks, Inc. products - CVE-2021-31361

Vulnerability identifier: #VU57439

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-31361

CWE-ID: CWE-754

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper check for unusual or exceptional conditions. A remote attacker can send specially crafted IP packets and perform a denial of service (DoS) attack.

QFX Series
PTX Series
Junos OS

Install updates from vendor's website.

Junos OS - addressed in versions 17.3R3-S11, 17.4R2-S13, 17.4R3-S4, 18.1R3-S12, 18.2R2-S8, 18.2R3-S7, 18.3R3-S4, 18.4R1-S8, 18.4R2-S7, 18.4R3-S7, 18.4R3-S9, 19.1R1-S6, 19.1R2-S2, 19.1R3-S4, 19.1R3-S6, 19.2R1-S6, 19.2R1-S7, 19.2R3-S2, 19.2R3-S3, 19.3R2-S6, 19.3R3-S1, 19.3R3-S3, 19.4R1-S4, 19.4R2-S3, 19.4R3-S1, 19.4R3-S5, 20.1R2, 20.1R2-S2, 20.1R3, 20.2R2, 20.2R3, 20.2R3-S1, 20.3R1-S1, 20.3R2, 20.3R2-S1, 20.3R3, 20.4R1, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1

• https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11223&cat=SIRT_1&actp=LIST

• Denial of service in Juniper Networks Junos OS on QFX and PTX Series