dbcve.org
Vpn Plus ServerApplication · Synology

CVE-2022-43931

CRITICAL · 10.0 CVSS v3.1 Published 2023-01-03
Fix available
A fix is available. Upgrade to 1.4.3-0534 / 1.4.4-0635 or later.
See remediation →
100/100
Remediation priority · Urgent
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
Out-of-bounds write vulnerability in Remote Desktop Functionality in Synology VPN Plus Server before 1.4.3-0534 and 1.4.4-0635 allows remote attackers to execute arbitrary commands via unspecified vectors.

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

An out-of-bounds write vulnerability exists in the Remote Desktop functionality of Synology VPN Plus Server. The flaw allows remote, unauthenticated attackers to execute arbitrary commands on affected systems by writing data beyond allocated memory boundaries. Versions prior to 1.4.3-0534 and 1.4.4-0635 are vulnerable.

MitigationApply vendor-supplied updates to Synology VPN Plus Server versions 1.4.3-0534 or 1.4.4-0635 or later. If immediate patching is not possible, consider restricting network access to VPN Plus Server management interfaces.

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
Vpn Plus ServerApplication
Affected:< 1.4.3-0534< 1.4.4-0635

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
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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. Verify VPN Plus Server is installed
    Check if the Synology VPN Plus Server package is installed on the system. In the Synology DSM interface, open Package Center and look for 'VPN Plus Server' in the installed packages list, or run 'pkginfo | grep -i vpn' via SSH.
    Affected if VPN Plus Server package is installed and appears in the package list
  2. Check installed VPN Plus Server version
    Locate the installed version of VPN Plus Server. In Package Center, click on VPN Plus Server and view the version information. Alternatively, run 'pkginfo -l synology-vpnplus' or check the package details via 'cat /var/packages/vpn_plus_server/info' if available.
    Affected if The displayed version is earlier than 1.4.3-0534 AND earlier than 1.4.4-0635 (vulnerable if either condition is true)
  3. Identify if Remote Desktop service is active
    Determine whether the Remote Desktop functionality within VPN Plus Server is enabled. Check the VPN Plus Server configuration via the web interface under the Remote Desktop section, or list running processes related to VPN Plus using 'ps aux | grep -i vpn' or 'ls -la /var/packages/vpn_plus_server/scripts/'
    Affected if Remote Desktop feature is provisioned, enabled, or the associated service process is running on the system
  4. Verify network exposure of VPN Plus management
    Inspect network listening services to confirm VPN Plus Server ports are exposed. Use 'netstat -tulpn | grep -i vpn' or check firewall rules via 'iptables -L' to see which interfaces the VPN Plus services are bound to.
    Affected if VPN Plus Server Remote Desktop service is listening on a network-facing interface (not localhost only)

A system is affected if VPN Plus Server is installed with a version prior to 1.4.3-0534 (or prior to 1.4.4-0635) AND the Remote Desktop functionality is enabled or accessible over the network.

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 1.4.3-0534 / 1.4.4-0635 or later
Fixed in 1.4.3-05341.4.4-0635
Interim mitigation

Apply vendor-supplied updates to Synology VPN Plus Server versions 1.4.3-0534 or 1.4.4-0635 or later. If immediate patching is not possible, consider restricting network access to VPN Plus Server management interfaces.

Recommended fix High confidence

VPN Plus Server 1.4.3-0534 or 1.4.4-0635 (depending on installed branch)

  1. 1. Log into Synology DSM and navigate to Package Center
  2. 2. Locate VPN Plus Server in the installed package list
  3. 3. Check the current version number to determine which upgrade path applies
  4. 4. If using version 1.4.3.x branch, upgrade to version 1.4.3-0534 or later
  5. 5. If using version 1.4.4.x branch, upgrade to version 1.4.4-0635 or later
  6. 6. Verify the upgrade completed successfully by checking the package version in Package Center

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

Fix this in Vpn Plus Server Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
  • Review / QA1.0 h
7.0 hours of engineering $1,240
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An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.

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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-2022-43931 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