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Junos Os EvolvedOperating system · Juniper

CVE-2024-39524

HIGH · 7.8 CVSS v3.1 Published 2024-07-11
Fix available
A fix is available. Upgrade to 20.4 or later.
See remediation →
80/100
Remediation priority · High
Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
An Improper Neutralization of Special Elements vulnerability in Juniper Networks Junos OS Evolved commands allows a local, authenticated attacker with low privileges to escalate their privileges to 'root' leading to a full compromise of the system. The Junos OS Evolved CLI doesn't properly handle command options in some cases, allowing users which execute specific CLI commands with a crafted set of parameters to escalate their privileges to root on shell level. This issue affects Junos OS Evolved: All versions before 20.4R3-S7-EVO, 21.2-EVO versions before 21.2R3-S8-EVO, 21.4-EVO versions before 21.4R3-S7-EVO,  22.2-EVO versions before 22.2R3-EVO, 22.3-EVO versions before 22.3R2-EVO, 22.4-EVO versions before 22.4R2-EVO.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Local privilege escalation vulnerability in Junos OS Evolved CLI where improper handling of command options allows authenticated low-privilege users to gain root shell access. The issue stems from insufficient input validation on CLI command parameters.

MitigationUpgrade Junos OS Evolved to the specified fixed versions (20.4R3-S7-EVO, 21.2R3-S8-EVO, 21.4R3-S7-EVO, 22.2R3-EVO, 22.3R2-EVO, or 22.4R2-EVO) or later per the version matrix. Restrict CLI access to trusted personnel until patches are applied.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Junos Os EvolvedOperating system
Affected:< 20.4= 20.4= 21.2= 21.4= 22.2= 22.3= 22.4

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Determine the Junos OS Evolved version
    Run 'show version' or 'version' command in the CLI to obtain the installed Junos OS Evolved version number
    Affected if The displayed version matches one of the affected versions: < 20.4, 20.4, 21.2, 21.4, 22.2, 22.3, or 22.4 (or falls between these such as 21.1, 21.3, 22.1, 22.5, 23.x, etc., which are also vulnerable)
  2. Identify authenticated CLI user accounts
    Review user accounts configured in the system using 'show configuration system login' to list all users with CLI access permissions
    Affected if There are non-root users configured with CLI login access (especially users with operator, read-only, or super-user privileges)
  3. Verify the vulnerable CLI command interface is exposed
    Attempt to access the CLI as a low-privilege user and examine whether the CLI command parser processes user-supplied options without proper validation
    Affected if Low-privilege authenticated users can execute CLI commands and pass arbitrary parameters to them

A system is affected if it runs a vulnerable Junos OS Evolved version (20.4, 21.2, 21.4, 22.2, 22.3, 22.4, or any version between these that is not patched) and has authenticated low-privilege users with CLI access.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 20.4 or later
Fixed in 20.4
Interim mitigation

Upgrade Junos OS Evolved to the specified fixed versions (20.4R3-S7-EVO, 21.2R3-S8-EVO, 21.4R3-S7-EVO, 22.2R3-EVO, 22.3R2-EVO, or 22.4R2-EVO) or later per the version matrix. Restrict CLI access to trusted personnel until patches are applied.

Recommended fix High confidence

20.4R3-S7-EVO, 21.2R3-S8-EVO, 21.4R3-S7-EVO, 22.2R3-EVO, 22.3R2-EVO, or 22.4R2-EVO (depending on your release train)

  1. Identify the current Junos OS Evolved version using 'show version' command
  2. Determine the appropriate upgrade path based on current version (20.4.x → 20.4R3-S7-EVO, 21.2.x → 21.2R3-S8-EVO, 21.4.x → 21.4R3-S7-EVO, 22.2.x → 22.2R3-EVO, 22.3.x → 22.3R2-EVO, 22.4.x → 22.4R2-EVO)
  3. Download the appropriate fixed EVO software package from Juniper Networks support portal
  4. Upload the software to the device using 'request system software add' or similar method
  5. Reboot the device to apply the upgrade using 'request system reboot'
  6. Verify the upgrade was successful and the version matches the fixed release
  7. Confirm the vulnerability is resolved by verifying the installed version is at or above the fixed releases listed
Caveat Review Juniper release notes for upgrade considerations; ensure compatibility with existing configurations and neighboring devices

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Junos Os Evolved Scoped from the published advisory
  • Consultation8.0 h
  • Implementation16.0 h
  • Testing12.0 h
  • Review / QA4.0 h
40.0 hours of engineering $7,000
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-39524 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data