9

CVE-2021-31350: juniper networks junos os Improper Privilege Management

CVSS: 9.0v2.0HighModified
Published 19-10-2021Last modified 16-09-2024
Open JSON

Vulnerability summary

CVE-2021-31350 is a high (CVSS 9.0) Improper Privilege Management vulnerability in juniper networks junos os. EPSS estimates a 0.87% chance of exploitation in the next 30 days, higher than 58.2% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.0/10
010
High · v2.0 (NVD)
EPSS score
0.87%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 19-10-2021
    PublishedVulnerability first disclosed.
  2. 16-09-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.87%

Chance of exploitation in the next 30 days

Percentile

58%

Versus all other CVEs

30-day change

0.00 pp

From 0.87% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.87%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Juniper2 products
  • junos18.4 | 18.4:r1 | 18.4:r1-s1 | 18.4:r1-s2 | 18.4:r1-s3 | 18.4:r1-s4 | 18.4:r1-s5 | 18.4:r1-s6 | 18.4:r1-s7 | 18.4:r2-s8 | 18.4:r3-s8 | 19.1 | 19.1:r1 | 19.1:r1-s1 | 19.1:r1-s2 | 19.1:r1-s3 | 19.1:r1-s4 | 19.1:r1-s5 | 19.1:r1-s6 | 19.1:r2 | 19.1:r2-s1 | 19.1:r2-s2 | 19.1:r3-s5 | 19.2 | 19.2:r1 | 19.2:r1-s1 | 19.2:r1-s2 | 19.2:r1-s3 | 19.2:r1-s4 | 19.2:r1-s5 | 19.2:r1-s6 | 19.2:r3-s2 | 19.3 | 19.3:r1 | 19.3:r1-s1 | 19.3:r2 | 19.3:r2-s1 | 19.3:r2-s2 | 19.3:r2-s3 | 19.3:r2-s4 | 19.3:r2-s5 | 19.3:r3-s2 | 19.4:r1 | 19.4:r1-s1 | 19.4:r1-s2 | 19.4:r1-s3 | 19.4:r2-s4 | 19.4:r3-s3 | 20.1:r1 | 20.1:r1-s1 | 20.1:r1-s2 | 20.1:r1-s3 | 20.1:r1-s4 | 20.1:r2 | 20.1:r2-s1 | 20.1:r3 | 20.2:r1 | 20.2:r1-s1 | 20.2:r1-s2 | 20.2:r1-s3 | 20.2:r2 | 20.2:r2-s1 | 20.2:r2-s2 | 20.2:r3 | 20.3:r1 | 20.3:r1-s1 | 20.3:r2 | 20.3:r3 | 20.4:r1 | 20.4:r1-s1
  • junos_os_evolved18.3:r1 | 19.1:r1 | 19.1:r2 | 19.2:r1 | 19.2:r2 | 19.3:r1 | 19.3:r2 | 19.4:r1 | 19.4:r1-s1 | 20.1:r1 | 20.1:r1-s1 | 20.1:r2 | 20.1:r2-s1 | 20.1:r2-s2 | 20.2:r1 | 20.2:r1-s1 | 20.2:r2 | 20.3:r1 | 20.3:r1-s1 | 20.3:r2 | 20.4:r1 | 21.1 | 21.1:r1-s1
Juniper networks2 products
  • junos os≥ 18.4, < 18.4R1-S8, 18.4R2-S8, 18.4R3-S8 | ≥ 19.1, < 19.1R2-S3, 19.1R3-S5 | ≥ 19.2, < 19.2R1-S7, 19.2R3-S2 | ≥ 19.3, < 19.3R2-S6, 19.3R3-S2 | ≥ 19.4, < 19.4R1-S4, 19.4R2-S4, 19.4R3-S3 | ≥ 20.1, < 20.1R2-S2, 20.1R3 | ≥ 20.2, < 20.2R2-S3, 20.2R3 | ≥ 20.3, < 20.3R2-S1, 20.3R3 | ≥ 20.4, < 20.4R2
  • junos os evolved≥ unspecified, < 20.4R2-EVO | ≥ 21.1-EVO, < 21.1R2-EVO

2 vendors · 4 products

References

1 links