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Stack-based Buffer OverflowWeakness · CWE-121

CVE-2025-34165

HIGH · 8.8 CVSS v4.0 Published 2025-08-30
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
97/100
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
A stack-based buffer overflow vulnerability in NetSupport Manager 14.x versions prior to 14.12.0000 allows a remote, unauthenticated attacker to cause a denial of service (DoS) or potentially leak a limited amount of memory.

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 stack-based buffer overflow in NetSupport Manager versions 14.x prior to 14.12.0000 allows a remote, unauthenticated attacker to cause a denial of service or potentially leak a limited amount of memory due to insufficient bounds checking when handling specific input.

MitigationUpgrade NetSupport Manager to version 14.12.0000 or later to remediate the buffer overflow vulnerability.

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
Network
Complexity
Low
Privileges
None
Authentication
X
User interaction
None
Scope
X

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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. Locate NetSupport Manager installation
    Check common installation directories (e.g., C:\Program Files\NetSupport or C:\Program Files (x86)\NetSupport) or use system inventory tools to find NetSupport Manager components
    Affected if NetSupport Manager is installed on the system
  2. Identify installed version
    Check the program's version information through the executable properties, registry keys under HKLM\SOFTWARE\NetSupport\NetSupport Manager, or by running 'netsupportservice --version' if available
    Affected if The installed version is 14.x and lower than 14.12.0000
  3. Verify if NetSupport Manager service is exposed
    Check if the NetSupport Manager service is running and listening on network ports (typically TCP ports 5405, 5406 for remote control) using netstat or similar network tools
    Affected if The service is running and accessible over the network, making it exploitable by remote attackers
  4. Confirm version comparison
    Compare the detected version string against the affected range: any 14.x version prior to 14.12.0000 is vulnerable
    Affected if Version falls within 14.0.0.0 through 14.11.x.x (any build below 14.12.0000)

If NetSupport Manager version 14.x below 14.12.0000 is installed and its service is running and network-accessible, the environment is affected by this vulnerability.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Upgrade NetSupport Manager to version 14.12.0000 or later to remediate the buffer overflow vulnerability.

Recommended fix High confidence

14.12.0000

  1. 1. Identify the currently installed version of NetSupport Manager by checking the software's About or version information
  2. 2. If the installed version is 14.x prior to 14.12.0000, download NetSupport Manager version 14.12.0000 or later from the official vendor website (www.netsupportmanager.com)
  3. 3. Backup the current NetSupport Manager configuration and data following vendor backup procedures
  4. 4. Stop any running NetSupport Manager services or processes before upgrading
  5. 5. Run the installer for version 14.12.0000 or later with appropriate administrator privileges
  6. 6. Follow the on-screen installation prompts to complete the upgrade
  7. 7. After installation, verify that the installed version is 14.12.0000 or later by checking the software's version information
  8. 8. Restart NetSupport Manager services and verify normal functionality

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

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing3.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,390
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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-2025-34165 in production — separate from our analysis above.

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What this is

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What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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