CVE-2019-6529Network attack vector

Device crash via oversized FTP filename

Published Jan 7, 2020 · Updated Aug 4, 2024

Improper input validation in the embedded FTP server of KUNBUS-GW Modbus TCP before 1.1.13166 allows remote authenticated users to crash the gateway. The server accepts filenames longer than 256 characters without sufficient length validation and crashes the device. Reachability requires authenticated FTP access; the documented impact is a gateway crash, with no confidentiality or integrity impact.

CVSS severity4.9
Medium
EPSS probability1.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in the embedded FTP server of KUNBUS-GW Modbus TCP before 1.1.13166 allows remote authenticated users to crash the gateway. The server accepts filenames longer than 256 characters without sufficient length validation and crashes the device. Reachability requires authenticated FTP access; the documented impact is a gateway crash, with no confidentiality or integrity impact.

The record

CVE
CVE-2019-6529
Published
Jan 7, 2020
Updated
Aug 4, 2024
Vendor
KUNBUS GmbH
Product
KUNBUS-GW Modbus TCP
Classifications
CWE-20, T0814
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 7, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=All versions prior to Release R02 (or Software Version 1.1.13166)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

KUNBUS GmbH · KUNBUS-GW Modbus TCPversion=All versions prior to Release R02 (or Software Version 1.1.13166)

Published CVSS scores

4.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
6.8NIST NVDAV:N/AC:L/Au:S/C:N/I:N/A:C

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T0814Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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