CVE-2024-0737Public exploitNetwork attack vector

Unauthenticated service interruption via oversized FTP username

Published Jan 19, 2024 · Updated Sep 12, 2024

Denial of service in the Login component of Xlight FTP Server 1.1 allows remote attackers to interrupt the FTP service via a crafted username. The public exploit submits a 500-byte username as the FTP USER value; Xlight has not disclosed how the Login component mishandles it. No authentication or user interaction is required, and the demonstrated consequence is limited to interruption of the FTP service.

CVSS severity5.3
Medium
EPSS probability4.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Login component of Xlight FTP Server 1.1 allows remote attackers to interrupt the FTP service via a crafted username. The public exploit submits a 500-byte username as the FTP USER value; Xlight has not disclosed how the Login component mishandles it. No authentication or user interaction is required, and the demonstrated consequence is limited to interruption of the FTP service.

The record

CVE
CVE-2024-0737
Published
Jan 19, 2024
Updated
Sep 12, 2024
Vendor
Xlight
Product
Xlight FTP Server
Classifications
CWE-404, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 12, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Xlight · Xlight FTP Serverversion=1.1

Published CVSS scores

5.3VulDBCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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