Vulnerability Details : CVE-2021-31350

An Improper Privilege Management vulnerability in the gRPC framework, used by the Juniper Extension Toolkit (JET) API on Juniper Networks Junos OS and Junos OS Evolved, allows a network-based, low-privileged authenticated attacker to perform operations as root, leading to complete compromise of the targeted system. The issue is caused by the JET service daemon (jsd) process authenticating the user, then passing configuration operations directly to the management daemon (mgd) process, which runs as root. This issue affects Juniper Networks Junos OS: 18.4 versions prior to 18.4R1-S8, 18.4R2-S8, 18.4R3-S8; 19.1 versions prior to 19.1R2-S3, 19.1R3-S5; 19.2 versions prior to 19.2R1-S7, 19.2R3-S2; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R1-S4, 19.4R2-S4, 19.4R3-S3; 20.1 versions prior to 20.1R2-S2, 20.1R3; 20.2 versions prior to 20.2R2-S3, 20.2R3; 20.3 versions prior to 20.3R2-S1, 20.3R3; 20.4 versions prior to 20.4R2. This issue does not affect Juniper Networks Junos OS versions prior to 18.4R1. Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-EVO; 21.1-EVO versions prior to 21.1R2-EVO.
Published 2021-10-19 19:15:09
Updated 2021-10-25 12:58:39
Source Juniper Networks, Inc.
View at NVD,   CVE.org

Products affected by CVE-2021-31350

Exploit prediction scoring system (EPSS) score for CVE-2021-31350

EPSS FAQ
0.10%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 42 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-31350

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
9.0
 HIGH AV:N/AC:L/Au:S/C:C/I:C/A:C
8.0
10.0
 NIST
8.8
 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
2.8
5.9
 NIST
7.5
 HIGH CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
1.6
5.9
 Juniper Networks, Inc.

CWE ids for CVE-2021-31350

  • The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.
    Assigned by:
    • nvd@nist.gov (Primary)
    • sirt@juniper.net (Secondary)

References for CVE-2021-31350

  • https://kb.juniper.net/JSA11215
    2021-10 Security Bulletin: Junos OS and Junos OS Evolved: Privilege escalation vulnerability in Juniper Extension Toolkit (JET) (CVE-2021-31350) - Juniper Networks
    Patch;Vendor Advisory
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