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Serv UApplication · Solarwinds

CVE-2025-40540

HIGH · 7.2 CVSS v3.1 Published 2026-02-24
Fix available
A fix is available. Upgrade to 15.5.4 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
A type confusion vulnerability exists in Serv-U which when exploited, gives a malicious actor the ability to execute arbitrary native code as privileged account. This issue requires administrative privileges to abuse. On Windows deployments, the risk is scored as a medium because services frequently run under less-privileged service accounts by default.

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 confidence

A type confusion vulnerability in SolarWinds Serv-U file transfer server allows an authenticated administrator to execute arbitrary native code with elevated (privileged) account privileges. This represents a privilege escalation from administrative to SYSTEM-level access.

MitigationRestrict administrative access to only necessary personnel, apply vendor patches when released, and on Windows ensure Serv-U runs under a dedicated low-privilege service account rather than SYSTEM or admin-level accounts.

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
Serv UApplication
Affected:< 15.5.4

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. Confirm SolarWinds Serv-U is installed
    Look for Serv-U in installed programs via Control Panel > Programs and Features, or check for the Serv-U installation directory (typically C:\Program Files\SolarWinds\Serv-U or C:\Serv-U)
    Affected if Serv-U is found installed on the system
  2. Identify installed Serv-U version
    Open Serv-U Administration console and view the About/Version information, or check the file version of Serv-U.exe in the installation directory
    Affected if The version number is lower than 15.5.4 (for example, 15.5.3, 15.4.0, etc.)
  3. Check if admin interface is network-accessible
    Verify if the Serv-U Administration web console port (typically ports 80, 443, or 8080) is listening and accessible from network locations rather than only localhost
    Affected if The admin interface is exposed beyond localhost or the local server
  4. Determine Serv-U Windows service account
    Open Windows Services, locate the Serv-U service, right-click and select Properties, then examine the Log On As account
    Affected if The service runs under SYSTEM, a domain admin account, or any account with elevated privileges beyond what is required

You are affected if Serv-U is installed with a version below 15.5.4 and the admin interface is accessible to an authenticated administrator on the system.

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 15.5.4 or later
Fixed in 15.5.4
Interim mitigation

Restrict administrative access to only necessary personnel, apply vendor patches when released, and on Windows ensure Serv-U runs under a dedicated low-privilege service account rather than SYSTEM or admin-level accounts.

Recommended fix High confidence

Serv-U 15.5.4

  1. Backup your current Serv-U configuration and data before proceeding with the upgrade.
  2. Download Serv-U version 15.5.4 or later from the official SolarWinds download portal at solarwinds.com or through your customer account.
  3. Stop the Serv-U service to ensure a clean upgrade process.
  4. Install the downloaded Serv-U 15.5.4 (or later) version using the standard installation wizard, selecting the upgrade option.
  5. Follow any prompts to complete the installation, preserving existing configuration settings when prompted.
  6. Start the Serv-U service after the installation completes.
  7. Verify the version number reflects 15.5.4 or later by checking the Serv-U admin console or using the version check command.
  8. Confirm normal operation by logging into the Serv-U admin interface and testing file transfer functionality.

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

Fix this in Serv U Scoped from the published advisory
  • Consultation4.0 h
  • Implementation2.0 h
  • Testing4.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,120
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,392.

Scan for this in your stack

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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-2025-40540 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