Improper Privilege Management in Junos OS and Junos OS Evolved - CVE-2021-31350

Vulnerability identifier: #VU57435

CSH Severity: Medium

CVSS v4: 7.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-31350

CWE-ID: CWE-269

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to escalate privileges.

The vulnerability exists due to improper privilege management in the gRPC framework. A remote authenticated attacker can escalate privileges.

Junos OS
Junos OS Evolved

Install updates from vendor's website.

Junos OS - addressed in versions 18.4R1-S8, 18.4R2-S8, 18.4R3-S8, 19.1R2-S3, 19.1R3-S5, 19.2R1-S7, 19.2R3-S2, 19.3R2-S6, 19.3R3-S2, 19.4R1-S4, 19.4R2-S4, 19.4R3-S3, 20.1R2-S2, 20.1R3, 20.2R2-S3, 20.2R3, 20.3R2-S1, 20.3R3, 20.4R2, 21.1R1
Junos OS Evolved - addressed in versions 20.4R2-EVO, 21.1R2-EVO, 21.2R1-EVO

• https://kb.juniper.net/InfoCenter/index?page=content&id=JSA11215&cat=SIRT_1&actp=LIST

• Privilege escalation in Juniper Networks Junos OS and Junos OS Evolved