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Junos Os EvolvedOperating system · Juniper

CVE-2024-47498

MEDIUM · 6.5 CVSS v3.1 Published 2024-10-11
Fix available
A fix is available. Upgrade to 21.4 or later.
See remediation →
70/100
Remediation priority · Elevated
No privileges 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 Unimplemented or Unsupported Feature in UI vulnerability in the CLI of Juniper Networks Junos OS Evolved on QFX5000 Series allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS). Several configuration statements meant to enforce limits on MAC learning and moves can be configured but do not take effect. This can lead to control plane overload situations which will severely impact the ability of the device to processes legitimate traffic. This issue affects Junos OS Evolved on QFX5000 Series: * All versions before 21.4R3-S8-EVO, * 22.2-EVO versions before 22.2R3-S5-EVO, * 22.4-EVO versions before 22.4R3-EVO, * 23.2-EVO versions before 23.2R2-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

On Juniper Junos OS Evolved for QFX5000 Series, certain configuration statements intended to enforce limits on MAC learning and MAC moves can be configured through the CLI but do not actually get enforced. This creates an unimplemented feature vulnerability where an unauthenticated adjacent attacker can trigger excessive MAC learning, leading to control plane overload and a denial-of-service condition.

MitigationUpgrade Junos OS Evolved to a patched version (21.4R3-S8-EVO, 22.2R3-S5-EVO, 22.4R3-EVO, or 23.2R2-EVO or later) to remediate this vulnerability.

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:< 21.4= 21.4= 22.2= 22.4= 23.2

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
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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. Identify the device model and OS type
    Run 'show system information' or 'show chassis hardware' to confirm the device is a QFX5000 series switch running Junos OS Evolved
    Affected if Device is a QFX5000 series switch running Junos OS Evolved
  2. Check the Junos OS Evolved version
    Run 'show version' to obtain the installed software version
    Affected if Version is < 21.4, 21.4, 22.2, 22.4, or 23.2
  3. Identify MAC learning limit configuration
    Run 'show configuration protocols layer2-control mac-table-size' or 'show configuration protocols layer2-control mac-limit' to see if MAC table size limits are configured
    Affected if MAC table size or MAC limit configuration statements exist in the active configuration
  4. Identify MAC move limit configuration
    Run 'show configuration protocols layer2-control mac-move-limit' or search for 'mac-move' in the configuration to see if MAC move limits are configured
    Affected if MAC move limit configuration statements exist in the active configuration
  5. Verify MAC limit enforcement
    Attempt to add more MAC addresses than the configured limit to see if the limit is actually enforced, or monitor MAC learning behavior under high MAC traffic conditions
    Affected if Configured MAC limits or MAC move limits are not being enforced (MAC addresses continue to be learned beyond configured limits)

If the device is a QFX5000 series on Junos OS Evolved with a version in the affected list AND has MAC table size or MAC move limit configurations that are not being enforced, the environment is vulnerable to this CVE.

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 21.4 or later
Fixed in 21.4
Interim mitigation

Upgrade Junos OS Evolved to a patched version (21.4R3-S8-EVO, 22.2R3-S5-EVO, 22.4R3-EVO, or 23.2R2-EVO or later) to remediate this vulnerability.

Recommended fix High confidence

21.4R3-S8-EVO, 22.2R3-S5-EVO, 22.4R3-EVO, or 23.2R2-EVO (or later)

  1. Identify the current Junos OS Evolved version running on the QFX5000 Series device using 'show version' command
  2. Plan upgrade to one of the fixed releases: 21.4R3-S8-EVO, 22.2R3-S5-EVO, 22.4R3-EVO, or 23.2R2-EVO (or later)
  3. Review Juniper Networks upgrade documentation and release notes for the target version
  4. Backup the current device configuration using 'request system configuration rescue save' or equivalent
  5. Download the appropriate upgrade image from Juniper Networks support portal
  6. Transfer the software image to the device and verify integrity per Juniper documentation
  7. Execute the upgrade following Juniper's standard upgrade procedure for Junos OS Evolved
  8. After upgrade, verify the device is operational and test that MAC learning limit configurations are now enforced properly
Caveat Standard Junos upgrade considerations apply - review config compatibility, test in lab first, plan for possible downtime

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

Fix this in Junos Os Evolved Scoped from the published advisory
  • Consultation4.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
13.0 hours of engineering $2,330
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,728.

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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-2024-47498 in production — separate from our analysis above.

No notes yet

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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