CVE-2025-32817
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 · uneditedA Improper Link Resolution vulnerability (CWE-59) in the SonicWall Connect Tunnel Windows (32 and 64 bit) client, this results in unauthorized file overwrite, potentially leading to denial of service or file corruption.
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 · moderate confidenceImproper Link Resolution (CWE-59) vulnerability in SonicWall Connect Tunnel Windows client allows local attackers to manipulate symbolic links, causing the application to write files to unintended locations. This can result in denial of service or file corruption through unauthorized file overwrite.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- Low
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/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 checksWork through these to decide whether this CVE applies to you.
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Verify SonicWall Connect Tunnel installationOpen Control Panel > Programs and Features, or run 'Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName, DisplayVersion' in PowerShell to list installed programsAffected if SonicWall Connect Tunnel appears in installed programs
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Identify installed Connect Tunnel versionNavigate to the Connect Tunnel installation directory (typically C:\Program Files\SonicWall\Connect Tunnel or C:\Program Files (x86)\SonicWall\Connect Tunnel), right-click the executable, select Properties, and check the Details tab for version informationAffected if The version falls within the affected range (compare to vendor advisory when available)
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Check application directory permissionsRight-click the Connect Tunnel installation folder, select Properties > Security, and review Write permissions for users or groupsAffected if Users with low privilege have Write or Modify permissions to the application directory, enabling symlink manipulation
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Inspect for suspicious symlinks in application pathOpen Command Prompt as Administrator and run 'dir C:\Program Files\SonicWall\Connect Tunnel /AL /S' to list any symbolic links in the application treeAffected if Any symbolic links exist in or below the Connect Tunnel directory that were not created by the application setup
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Check for file write behavior in non-standard locationsUse Process Monitor (Sysinternals) with a filter for Connect Tunnel process, monitor Write operations, and verify if files are being written outside expected directoriesAffected if Connect Tunnel writes files to locations outside its designated application or data directories
A system is affected if SonicWall Connect Tunnel is installed with a vulnerable version and the application directory or its contents are writable by local users who could create or manipulate symbolic links.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor dataApply vendor-supplied patch when available; restrict write permissions in the application directory; monitor for unauthorized symlink creation in application paths; consider application sandboxing or isolation.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-32817 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-32817 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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
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