CVE-2024-4599
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 · uneditedRemote denial of service vulnerability in LAN Messenger affecting version 3.4.0. This vulnerability allows an attacker to crash the LAN Messenger service by sending a long string directly and continuously over the UDP protocol.
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 confidenceA remote denial of service vulnerability exists in LAN Messenger 3.4.0 where the application fails to properly handle excessively long strings sent repeatedly over UDP. The lack of input validation or bounds checking on UDP packet processing allows an attacker to crash the service by sending crafted packets with oversized payloads.
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
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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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Identify LAN Messenger installationSearch for lanmsgr.exe or the LAN Messenger application directory on the system. Common paths include C:\Program Files\LAN Messenger or C:\Program Files (x86)\LAN Messenger on Windows.Affected if LAN Messenger is installed on the system.
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Verify installed versionRight-click on lanmsgr.exe, select Properties, and check the File Version in the Details tab. Alternatively, launch the application and check Help > About for the version number.Affected if The installed version is exactly 3.4.0.
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Confirm UDP service is enabledLaunch LAN Messenger and check if the application is configured to run in network mode. Verify UDP port (default 5001) is open and listening using command: netstat -an | findstr 5001Affected if LAN Messenger is running and listening on a UDP port for incoming messages.
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Check for unusual UDP traffic or service crashesMonitor the application for unexpected crashes or freezes. Use Wireshark or TCPdump to capture UDP traffic on the configured port and inspect for unusually large packets.Affected if The service experiences crashes or receives oversized UDP packets.
A user is affected if LAN Messenger version 3.4.0 is installed, the UDP messaging service is enabled, and the application is vulnerable to crash upon receiving oversized UDP packets.
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 dataImplement proper input validation and bounds checking on all UDP packet handling code, or apply any available vendor patch. Consider implementing rate limiting or firewall rules to filter malicious UDP traffic.
- Consultation2.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2024-4599 — 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-2024-4599 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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