CVE-2024-0816

Authenticated service interruption via crafted CLI strings

Published May 21, 2024 · Updated Aug 1, 2024

Buffer overflow in Zyxel DX3300-T1 Firmware 5.50(ABVY.4)C0 allows local users to interrupt service via crafted CLI strings. Zyxel identifies the CLI command path and crafted string input but has not disclosed the affected command, buffer, or unchecked copy operation. An authenticated local CLI session is required, and the documented consequence is denial of service with no reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in Zyxel DX3300-T1 Firmware 5.50(ABVY.4)C0 allows local users to interrupt service via crafted CLI strings. Zyxel identifies the CLI command path and crafted string input but has not disclosed the affected command, buffer, or unchecked copy operation. An authenticated local CLI session is required, and the documented consequence is denial of service with no reported data disclosure or modification.

The record

CVE
CVE-2024-0816
Published
May 21, 2024
Updated
Aug 1, 2024
Vendor
Zyxel Networks
Product
DX3300-T1 Firmware
Classifications
CWE-120, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 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=V5.50(ABVY.4)C0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Zyxel Networks · DX3300-T1 Firmwareversion=V5.50(ABVY.4)C0

Published CVSS scores

5.5Zyxel CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

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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