VpnApplication · Softether

CVE-2023-32634

HIGH · 7.4 CVSS v3.1 Published 2023-10-12
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
79/100
Remediation priority · High
Public exploit No privileges Zero-click Patch available

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 authentication bypass vulnerability exists in the CiRpcServerThread() functionality of SoftEther VPN 5.01.9674 and 4.41-9782-beta. An attacker can perform a local man-in-the-middle attack to trigger this vulnerability.

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

A detailed technical summary for this CVE is being prepared.

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
VpnApplication
Affected:= 4.41-9782= 5.01.9674

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

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

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
Patch available Apply the vendor patch
Vendor patch www.softether.org →
Recommended fix Moderate confidence

SoftEther VPN 5.01.9700 or later (stable release); alternatively 4.42 or later in the 4.x beta line

  1. 1. Download the latest stable SoftEther VPN server package from the official SoftEther download page (https://www.softether.org/download)
  2. 2. Stop the SoftEther VPN Server service before upgrading
  3. 3. Install or extract the new version over the existing installation
  4. 4. Restart the SoftEther VPN Server service
  5. 5. Verify the VPN server is running and accessible
  6. 6. Review server configuration to ensure no unintended changes occurred during upgrade
Caveat Review release notes for your version branch as minor configuration changes may occur between major releases

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

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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-2023-32634 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
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