dbcve.org
Webaccess\/vpnApplication · Advantech

CVE-2025-34239

HIGH · 7.2 CVSS v3.1 Published 2025-11-06
Fix available
A fix is available. Upgrade to 1.1.5 or later.
See remediation →
78/100
Remediation priority · High
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
Advantech WebAccess/VPN versions prior to 1.1.5 contain a command injection vulnerability in AppManagementController.appUpgradeAction() that allows an authenticated system administrator to execute arbitrary commands as the web server user (www-data) by supplying a crafted uploaded filename.

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

Advantech WebAccess/VPN versions prior to 1.1.5 contain a command injection vulnerability in the AppManagementController.appUpgradeAction() method. An authenticated system administrator can execute arbitrary commands as the web server user (www-data) by supplying a crafted uploaded filename during the upgrade function.

MitigationUpgrade to WebAccess/VPN version 1.1.5 or later. Until upgrade is possible, restrict administrative access to trusted users only and implement monitoring for suspicious upload requests.

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
Webaccess\/vpnApplication
Affected:< 1.1.5

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

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/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 installed WebAccess/VPN version
    Locate the WebAccess/VPN installation directory and check for version information in configuration files, about pages, or the installer. Common paths may include /opt/webaccess/, C:\Program Files\Advantech\WebAccess\, or check the application's built-in version display.
    Affected if The installed version is found to be less than 1.1.5 (for example, 1.1.4, 1.1.3, 1.0.x, etc.)
  2. Verify web management interface availability
    Confirm that the WebAccess/VPN web interface is accessible on the expected port (commonly 80, 443, or 8080). Attempt to reach the login page via browser or curl command.
    Affected if The web interface is accessible and responds to HTTP/HTTPS requests, indicating the vulnerable component is exposed.
  3. Confirm administrative access is possible
    Attempt to log into the WebAccess/VPN administrative interface using valid administrator credentials, or verify that administrative user accounts exist in the user database or Active Directory configuration.
    Affected if Administrative authentication is enabled and functional, allowing an attacker to reach the upgrade function.
  4. Check if upgrade feature is enabled
    After authentication, navigate to the application upgrade or management section of the web interface to determine if the appUpgradeAction() functionality is available and accessible to the authenticated administrator role.
    Affected if The upgrade/management functionality is present and accessible to authenticated administrators.

You are affected if WebAccess/VPN version is identified as less than 1.1.5 AND the web management interface is accessible with administrative credentials, allowing reach to the vulnerable upgrade function.

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 1.1.5 or later
Fixed in 1.1.5
Interim mitigation

Upgrade to WebAccess/VPN version 1.1.5 or later. Until upgrade is possible, restrict administrative access to trusted users only and implement monitoring for suspicious upload requests.

Recommended fix High confidence

WebAccess/VPN version 1.1.5

  1. Verify current WebAccess/VPN version by checking the admin interface or system information
  2. Download WebAccess/VPN version 1.1.5 from the official Advantech support portal (advantech.com) or authorized distribution channel
  3. Review release notes for version 1.1.5 to understand any configuration or migration requirements
  4. Create a full backup of the current WebAccess/VPN installation including configuration files and databases
  5. Schedule a maintenance window as upgrade may require service restart
  6. Stop WebAccess/VPN services before performing the upgrade
  7. Install version 1.1.5 following the official upgrade procedure documented by Advantech
  8. Verify the upgrade was successful by checking the version in the admin interface
Caveat Review vendor release notes for any configuration changes required when upgrading to 1.1.5; test in non-production environment first

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

Fix this in Webaccess\/vpn 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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An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,408.

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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-2025-34239 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