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JunosOperating system · Juniper

CVE-2024-30398

HIGH · 7.5 CVSS v3.1 Published 2024-04-12
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
84/100
Remediation priority · High
Remotely reachable 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 Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS allows an unauthenticated, network-based attacker to cause a Denial of Service (DoS). When a high amount of specific traffic is received on a SRX4600 device, due to an error in internal packet handling, a consistent rise in CPU memory utilization occurs. This results in packet drops in the traffic and eventually the PFE crashes. A manual reboot of the PFE will be required to restore the device to original state. This issue affects Junos OS:   * 21.2 before 21.2R3-S7, * 21.4 before 21.4R3-S6,  * 22.1 before 22.1R3-S5, * 22.2 before 22.2R3-S3, * 22.3 before 22.3R3-S2, * 22.4 before 22.4R3, * 23.2 before 23.2R1-S2, 23.2R2.

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

A memory buffer handling vulnerability in the Packet Forwarding Engine (PFE) of Juniper Junos OS on SRX4600 devices allows an unauthenticated attacker to cause denial of service. When the device receives high volumes of specific traffic, an internal packet handling error causes progressive CPU memory utilization increases, leading to packet drops and ultimately PFE crash requiring manual reboot.

MitigationApply the vendor-supplied patches for the respective version branches (21.2R3-S7+, 21.4R3-S6+, 22.1R3-S5+, 22.2R3-S3+, 22.3R3-S2+, 22.4R3+, 23.2R1-S2+/23.2R2+). Until patching is feasible, consider implementing traffic rate limiting or access controls to reduce exposure to the specific attack vector.

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
JunosOperating system
Affected:= 21.2= 21.4= 22.1= 22.2= 22.3= 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
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/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 device model
    Run 'show chassis hardware' or 'show system information' to confirm the device is an SRX4600
    Affected if Device model is not SRX4600 - this CVE only affects SRX4600 devices
  2. Check Junos OS version
    Run 'show version' or 'show system version' to retrieve the installed Junos OS version
    Affected if Version matches 21.2, 21.4, 22.1, 22.2, 22.3, 22.4, or 23.2 (any point release within these branches)
  3. Verify PFE status and CPU utilization
    Run 'show chassis fpc pic-status' and 'show system processes extensive' to check PFE status and CPU usage on the PIC
    Affected if PFE shows offline or CPU utilization is abnormally high with progressive increase under traffic load
  4. Check for packet drops and errors
    Run 'show interfaces statistics' and 'show pfe statistics traffic' to look for increasing packet drop counters on ingress interfaces
    Affected if Packet drops are increasing significantly on one or more interfaces without corresponding traffic policy matches

Device is affected if it is an SRX4600 running Junos version 21.2, 21.4, 22.1, 22.2, 22.3, 22.4, or 23.2 and is experiencing high CPU utilization or packet drops under specific traffic patterns

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply the vendor-supplied patches for the respective version branches (21.2R3-S7+, 21.4R3-S6+, 22.1R3-S5+, 22.2R3-S3+, 22.3R3-S2+, 22.4R3+, 23.2R1-S2+/23.2R2+). Until patching is feasible, consider implementing traffic rate limiting or access controls to reduce exposure to the specific attack vector.

Recommended fix High confidence

Upgrade to Junos OS 22.4R3 or later (or the equivalent S-series release for your branch: 21.2R3-S7, 21.4R3-S6, 22.1R3-S5, 22.2R3-S3, 22.3R3-S2, 23.2R1-S2 or later)

  1. 1. Identify the current Junos OS version running on the SRX4600 device using 'show version'
  2. 2. Schedule a maintenance window for the upgrade procedure
  3. 3. Back up the current device configuration using 'request system configuration rescue save'
  4. 4. Download the appropriate fixed Junos OS release from Juniper Networks (e.g., 22.4R3 or later)
  5. 5. Upload the Junos upgrade image to the device using 'request system software add' with the validate option
  6. 6. Reboot the device using 'request system reboot'
  7. 7. After reboot, verify the new Junos version is running with 'show version'
  8. 8. Confirm the PFE is operational using 'show chassis fpc' and 'show pfe statistics'
Caveat Standard Junos OS upgrade precautions apply; always test in a lab environment first, review release notes for any behavioral changes, and ensure configuration compatibility

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

Fix this in Junos Scoped from the published advisory
  • Consultation2.0 h
  • Implementation4.0 h
  • Testing6.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,380
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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-2024-30398 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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