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Junos Os EvolvedOperating system · Juniper

CVE-2026-57028

HIGH · 7.3 CVSS v3.1 Published 2026-07-09
Fix available
A fix is available. Upgrade to 23.2 or later.
See remediation →
82/100
Remediation priority · High
Remotely reachable No privileges Zero-click 6 weeks old

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 allows an unauthenticated, network-based attacker to cause license exhaustion. Due to an incorrect initialization, a process which should only be able to communicate internally within the device, can be reached over the network via an open port. This leads to unauthorized access to the license management. This issue affects all Junos OS Evolved 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

In Junos OS Evolved, a process intended for internal-only communication is incorrectly initialized at boot, causing it to bind to a network-accessible port. This allows unauthenticated remote attackers to reach the license management interface over the network, leading to license exhaustion.

MitigationUpgrade Junos OS Evolved to version 23.2R2-EVO or later to patch the improper initialization. If immediate upgrade is not possible, network segmentation and firewall rules should be applied to restrict access to the affected device.

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:< 23.2= 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
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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. Identify Junos OS Evolved version
    Run 'show version' or 'show version detail' on the device to obtain the exact Junos OS Evolved version installed.
    Affected if The installed version is 23.2 or any version prior to 23.2 (e.g., 23.1, 22.4, etc.).
  2. Verify license management port exposure
    Run 'show system connections' or use 'netstat -an' to identify listening ports. Look for the license management service port (typically port 2020 or similar internal license ports) bound to 0.0.0.0 or any external interface.
    Affected if The license management port is listening on a network-accessible IP address rather than only localhost (127.0.0.1) or internal loopback.
  3. Check internal process binding
    Use 'show system processes' or inspect running processes to identify the internal communication process. Use 'show system services' to confirm if the license management interface is exposed externally.
    Affected if The internal-only process is bound to a reachable network interface rather than being isolated to internal communication paths.
  4. Validate network accessibility
    From an external host, attempt to reach the license management port on the affected device (e.g., nc -v <device-ip> 2020 or telnet to the suspected license port).
    Affected if The connection succeeds, indicating the license management interface is accessible over the network without authentication.

A user is affected if their Junos OS Evolved version is 23.2 or earlier and the license management port is exposed on a network-accessible interface.

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 23.2 or later
Fixed in 23.2
Interim mitigation

Upgrade Junos OS Evolved to version 23.2R2-EVO or later to patch the improper initialization. If immediate upgrade is not possible, network segmentation and firewall rules should be applied to restrict access to the affected device.

Recommended fix High confidence

23.2R2-EVO or later

  1. 1. Identify the current Junos OS Evolved version by running 'show version'
  2. 2. Download Junos OS Evolved 23.2R2-EVO or later from the Juniper Networks support portal (supportportal.juniper.net)
  3. 3. Review the Junos OS Evolved upgrade guide for proper upgrade procedures
  4. 4. Backup the current configuration using 'request system configuration rescue save'
  5. 5. Upload the new Junos OS Evolved image to the device
  6. 6. Perform the upgrade using 'request system software add <package-name>' and reboot
  7. 7. After reboot, verify the new version is running with 'show version'
  8. 8. Confirm the vulnerability is resolved by checking that the internal process is no longer exposed on the network
Caveat Review Junos OS Evolved 23.2R2-EVO release notes for any known compatibility issues or configuration changes before upgrading

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
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
16.0 hours of engineering $2,840
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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-2026-57028 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