CVE-2024-1016Public exploitNetwork attack vector

Service crash via oversized PASV command

Published Jan 29, 2024 · Updated Jun 17, 2025

Denial of service in Solar FTP Server 2.1.1 and 2.1.2 allows remote attackers to crash the FTP service via an oversized PASV command. The PASV handler processes multi-kilobyte command arguments without enforcing a safe length, causing the service process to terminate. The public proof of concept logs in anonymously and interrupts FTP availability for all connected users without affecting confidentiality or integrity.

CVSS severity7.5
High
EPSS probability1.35%
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 Solar FTP Server 2.1.1 and 2.1.2 allows remote attackers to crash the FTP service via an oversized PASV command. The PASV handler processes multi-kilobyte command arguments without enforcing a safe length, causing the service process to terminate. The public proof of concept logs in anonymously and interrupts FTP availability for all connected users without affecting confidentiality or integrity.

The record

CVE
CVE-2024-1016
Published
Jan 29, 2024
Updated
Jun 17, 2025
Vendor
Flexbyte Software
Product
Solar FTP Server
Classifications
CWE-404, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=2.1.1
  2. Affected versionversion=2.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Flexbyte Software · Solar FTP Serverversion=2.1.1; version=2.1.2

Published CVSS scores

7.5NIST NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
T1499Endpoint Denial of Service

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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