Vulnerability Details : CVE-2021-31385

An Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in J-Web of Juniper Networks Junos OS allows any low-privileged authenticated attacker to elevate their privileges to root. This issue affects: Juniper Networks Junos OS 12.3 versions prior to 12.3R12-S19; 15.1 versions prior to 15.1R7-S10; 18.3 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 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R3-S3; 19.4 versions prior to 19.4R3-S5; 20.1 versions prior to 20.1R2-S2, 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2.
Published 2021-10-19 19:15:11
Updated 2021-10-25 17:10:04
Source Juniper Networks, Inc.
View at NVD,   CVE.org
Vulnerability category: Directory traversal

Exploit prediction scoring system (EPSS) score for CVE-2021-31385

Probability of exploitation activity in the next 30 days: 0.13%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 47 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-31385

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
8.5
 HIGH AV:N/AC:M/Au:S/C:C/I:C/A:C
6.8
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
 Juniper Networks, Inc.

CWE ids for CVE-2021-31385

  • The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
    Assigned by:
    • nvd@nist.gov (Primary)
    • sirt@juniper.net (Secondary)

References for CVE-2021-31385

  • https://kb.juniper.net/JSA11253
    2021-10 Security Bulletin: Junos OS: J-Web: A path traversal vulnerability allows an authenticated attacker to elevate their privileges to root (CVE-2021-31385) - Juniper Networks
    Vendor Advisory

Products affected by CVE-2021-31385

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