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Junos Os EvolvedOperating system · Juniper

CVE-2024-39537

MEDIUM · 6.5 CVSS v3.1 Published 2024-07-11
Fix available
A fix is available. Upgrade to 21.4 or later.
See remediation →
74/100
Remediation priority · Elevated
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 Communication Channel to Intended Endpoints vulnerability in Juniper Networks Junos OS Evolved on ACX 7000 Series allows an unauthenticated, network-based attacker to cause a limited information disclosure and availability impact to the device. Due to a wrong initialization, specific processes which should only be able to communicate internally within the device can be reached over the network via open ports. This issue affects Junos OS Evolved on ACX 7000 Series: * All versions before 21.4R3-S7-EVO, * 22.2-EVO versions before 22.2R3-S4-EVO, * 22.3-EVO versions before 22.3R3-S3-EVO, * 22.4-EVO versions before 22.4R3-S2-EVO, * 23.2-EVO versions before 23.2R2-EVO, * 23.4-EVO versions before 23.4R1-S1-EVO, 23.4R2-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

This vulnerability in Juniper Networks Junos OS Evolved on ACX 7000 Series involves improper initialization that exposes internal processes, which should only communicate locally within the device, to the network via open ports. An unauthenticated, network-based attacker can reach these processes, leading to limited information disclosure and availability impact.

MitigationUpgrade Junos OS Evolved on ACX 7000 Series to one of the patched versions specified in the advisory (21.4R3-S7-EVO, 22.2R3-S4-EVO, 22.3R3-S3-EVO, 22.4R3-S2-EVO, 23.2R2-EVO, 23.4R1-S1-EVO, or 23.4R2-EVO depending on the release train).

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= 22.3= 22.4= 23.2= 23.4

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
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low

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

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. Confirm device is ACX 7000 Series
    Run 'show chassis hardware' or 'show system information' to identify the hardware model
    Affected if Device is not an ACX 7000 Series - this vulnerability only affects this specific platform
  2. Check installed Junos OS Evolved version
    Run 'show version' to display the installed Junos OS Evolved version number
    Affected if Version is 21.4, 22.2, 22.3, 22.4, 23.2, or 23.4, or any version earlier than 21.4
  3. Verify open ports on the device
    Run 'show system connections' or 'netstat -an' to list listening ports and compare against expected baseline configuration
    Affected if Unexpected ports are listening that correspond to internal processes exposed to the network

Device is affected if it is an ACX 7000 Series running Junos OS Evolved version 21.4, 22.2, 22.3, 22.4, 23.2, 23.4, or any version prior to 21.4, with internal processes accessible via network ports

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 on ACX 7000 Series to one of the patched versions specified in the advisory (21.4R3-S7-EVO, 22.2R3-S4-EVO, 22.3R3-S3-EVO, 22.4R3-S2-EVO, 23.2R2-EVO, 23.4R1-S1-EVO, or 23.4R2-EVO depending on the release train).

Recommended fix High confidence

Upgrade to one of: 21.4R3-S7-EVO, 22.2R3-S4-EVO, 22.3R3-S3-EVO, 22.4R3-S2-EVO, 23.2R2-EVO, 23.4R1-S1-EVO, or 23.4R2-EVO (whichever is the next stable release for your branch)

  1. Identify the current Junos OS Evolved version on the ACX 7000 Series device using 'show version'
  2. Determine the appropriate upgrade path based on current version: if running a version before 21.4R3-S7-EVO, upgrade to 21.4R3-S7-EVO or later; if running 22.2 before 22.2R3-S4-EVO, upgrade to 22.2R3-S4-EVO or later; if running 22.3 before 22.3R3-S3-EVO, upgrade to 22.3R3-S3-EVO or later
  3. Download the appropriate fixed Junos OS Evolved image from the Juniper Networks support portal
  4. Upload the new image to the device using 'request system software add' with the appropriate package path
  5. Reboot the device to apply the new software version using 'request system reboot'
  6. After reboot, verify the fix is applied by confirming the new version is running with 'show version'
Caveat Standard Junos OS upgrade considerations apply - review release notes for your specific version for any configuration or compatibility changes

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

Fix this in Junos Os Evolved Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,130
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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-2024-39537 in production — separate from our analysis above.

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What this is

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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