7.3

CVE-2026-21916

Junos OS: A low privileged user can escalate their privileges so that they can login as root

A UNIX Symbolic Link (Symlink) Following vulnerability in the CLI of Juniper Networks Junos OS allows a local, authenticated attacker with low privileges to escalate their privileges to root which will lead to a complete compromise of the system.

When after a user has performed a specific 'file link ...' CLI operation, another user commits (unrelated configuration changes), the first user can login as root.

This issue affects Junos OS:
  *  all versions before 23.2R2-S7,
  *  23.4 versions before 23.4R2-S6,
  *  24.2 versions before 24.2R2-S3,
  *  24.4 versions before 24.4R2-S2,
  *  25.2 versions before 25.2R2.


This issue does not affect versions 25.4R1 or later.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Juniper ≫ Junos Version < 23.2
Juniper ≫ Junos Version 23.2 Update -
Juniper ≫ Junos Version 23.2 Update r1
Juniper ≫ Junos Version 23.2 Update r1-s1
Juniper ≫ Junos Version 23.2 Update r1-s2
Juniper ≫ Junos Version 23.2 Update r2
Juniper ≫ Junos Version 23.2 Update r2-s1
Juniper ≫ Junos Version 23.2 Update r2-s2
Juniper ≫ Junos Version 23.2 Update r2-s3
Juniper ≫ Junos Version 23.2 Update r2-s4
Juniper ≫ Junos Version 23.2 Update r2-s5
Juniper ≫ Junos Version 23.2 Update r2-s6
Juniper ≫ Junos Version 23.4 Update -
Juniper ≫ Junos Version 23.4 Update r1
Juniper ≫ Junos Version 23.4 Update r1-s1
Juniper ≫ Junos Version 23.4 Update r1-s2
Juniper ≫ Junos Version 23.4 Update r2
Juniper ≫ Junos Version 23.4 Update r2-s1
Juniper ≫ Junos Version 23.4 Update r2-s2
Juniper ≫ Junos Version 23.4 Update r2-s3
Juniper ≫ Junos Version 23.4 Update r2-s4
Juniper ≫ Junos Version 23.4 Update r2-s5
Juniper ≫ Junos Version 24.2 Update -
Juniper ≫ Junos Version 24.2 Update r1
Juniper ≫ Junos Version 24.2 Update r1-s1
Juniper ≫ Junos Version 24.2 Update r1-s2
Juniper ≫ Junos Version 24.2 Update r2
Juniper ≫ Junos Version 24.2 Update r2-s1
Juniper ≫ Junos Version 24.2 Update r2-s2
Juniper ≫ Junos Version 24.4 Update -
Juniper ≫ Junos Version 24.4 Update r1
Juniper ≫ Junos Version 24.4 Update r1-s2
Juniper ≫ Junos Version 24.4 Update r1-s3
Juniper ≫ Junos Version 24.4 Update r2
Juniper ≫ Junos Version 24.4 Update r2-s1
Juniper ≫ Junos Version 25.2 Update -
Juniper ≫ Junos Version 25.2 Update r1
Juniper ≫ Junos Version 25.2 Update r1-s1
Juniper ≫ Junos Version 25.2 Update r1-s2
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.13% 0.028
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
Juniper 7.3 1.3 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Juniper 7 0 0
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:M/U:X
CWE-61 UNIX Symbolic Link (Symlink) Following

The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.

https://kb.juniper.net/JSA107807
Vendor Advisory
Mitigation