dbcve.org
G42 FirmwareOperating system · Nokia

CVE-2025-27024

MEDIUM · 6.5 CVSS v3.1 Published 2025-07-02
Fix available
A fix is available. Upgrade to 8.0 or later.
See remediation →
71/100
Remediation priority · Elevated
Remotely reachable 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
Unrestricted access to OS file system in SFTP service in Infinera G42 version R6.1.3 allows remote authenticated users to read/write OS files via SFTP connections. Details: Account members of the Network Administrator profile can access the target machine via SFTP with the same credentials used for SSH CLI access and are able to read all files according to the OS permission instead of remaining inside the chrooted directory position.

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

The SFTP service in Infinera G42 R6.1.3 fails to properly restrict authenticated Network Administrator users to a chrooted directory, allowing them to escape the intended file system confinement and access the entire OS filesystem via SFTP based on their OS-level permissions.

MitigationReconfigure the SFTP service to properly enforce chroot directory restrictions, ensuring Network Administrator users are confined to their designated directory and cannot access arbitrary OS files outside the chroot environment.

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
G42 FirmwareOperating system
Affected:>= 6.1.3, < 8.0

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

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 firmware version
    Run the command to display the system firmware version (e.g., 'show version' or 'system info' from the admin CLI). Compare the version number to the affected range: >= 6.1.3 and < 8.0.
    Affected if The firmware version falls within 6.1.3 to 7.x inclusive.
  2. Verify SFTP service is enabled
    Check the system configuration for the SFTP service status using the admin interface or CLI command (e.g., 'show services sftp' or similar).
    Affected if The SFTP service is currently enabled on the device.
  3. Examine SFTP chroot configuration
    Inspect the SFTP service configuration files or settings to determine if chroot directory enforcement is configured. Look for chroot settings in the SFTP daemon configuration.
    Affected if Chroot restrictions are either missing, misconfigured, or set to a permissive path (such as '/' or not set).
  4. Confirm Network Administrator role access
    Review the user role definitions to verify that Network Administrator users are assigned SFTP access permissions and check if their home directory is properly chrooted.
    Affected if Network Administrator users have SFTP access and their configuration does not restrict them to a specific chroot directory.

A system is affected if it runs Nokia G42 firmware version 6.1.3 or higher but below 8.0, has SFTP enabled, and the chroot directory restriction for Network Administrator users is either missing or misconfigured.

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 8.0 or later
Fixed in 8.0
Interim mitigation

Reconfigure the SFTP service to properly enforce chroot directory restrictions, ensuring Network Administrator users are confined to their designated directory and cannot access arbitrary OS files outside the chroot environment.

Recommended fix Moderate confidence

G42 Firmware version 8.0 or later

  1. Verify current firmware version using 'show version' or through the management interface
  2. Schedule a maintenance window for the firmware upgrade
  3. Download the G42 firmware version 8.0 or later from Infinera's official support portal
  4. Backup the current configuration using the appropriate backup procedures
  5. Upload the new firmware file to the device using SCP/SFTP or the web management interface
  6. Initiate the firmware upgrade process using 'software upgrade' or equivalent command
  7. Verify the upgrade was successful by checking the new version with 'show version'
  8. Test SFTP functionality to confirm the chroot environment is properly enforced
Caveat Review Infinera release notes for version 8.0 to check for any configuration or feature changes that may impact existing deployments

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

Fix this in G42 Firmware Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing2.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,980
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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-2025-27024 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