Home/CVE/An Improper Input Validation vulnerability in J-Web of Juniper Networks Junos OS allows a locally authenticated J-Web at
CVE

CVE-2021-31372

An Improper Input Validation vulnerability in J-Web of Juniper Networks Junos OS allows a locally authenticated J-Web at

An Improper Input Validation vulnerability in J-Web of Juniper Networks Junos OS allows a locally authenticated J-Web attacker to escalate their privileges to root over the target device. This issue affects: Juniper Networks Junos OS All versions prior to 18.3R3-S5.

18.4 versions prior to 18.4R3-S9.

19.1 versions prior to 19.1R3-S6.

19.2 versions prior to 19.2R3-S3.

19.3 versions prior to 19.3R3-S3.

19.4 versions prior to 19.4R3-S5.

20.1 versions prior to 20.1R3-S1.

20.2 versions prior to 20.2R3-S2.

20.3 versions prior to 20.3R3-S1.

20.4 versions prior to 20.4R3.

21.1 versions prior to 21.1R2, 21.1R3.

21.2 versions prior to 21.2R1-S1, 21.2R2;.

HIGH · CVSS 8.8 EPSS 0.00521
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-20Improper Input Validation
CWE-20Improper Input Validation
▤

Affected Products & Versions

2
juniper junos<= 18.2
juniper junosall versions
▣

Scoring & Timeline

8.8
HIGH · CVSS v3.1 · sirt@juniper.net
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD19 Oct 2021 · 07:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://kb.juniper.net/JSA11237Vendor Advisory
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