CVE-2023-28768

Service interruption via improperly handled LAN frames

Published Aug 14, 2023 · Updated Oct 1, 2024

Denial of service in Zyxel XGS2220-30, XMG1930-30, and XS1930-10 firmware allows remote attackers to disrupt switches via crafted LAN frames. In versions 4.80(ABXN.1), 4.80(ACAR.1), and 4.80(ABQE.1), the frame-processing path handles crafted frames improperly; Zyxel has not disclosed the affected parser or precise failure operation. Access to the same LAN and no authentication are required, and the documented consequence is service interruption rather than data access or modification.

CVSS severity6.5
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in Zyxel XGS2220-30, XMG1930-30, and XS1930-10 firmware allows remote attackers to disrupt switches via crafted LAN frames. In versions 4.80(ABXN.1), 4.80(ACAR.1), and 4.80(ABQE.1), the frame-processing path handles crafted frames improperly; Zyxel has not disclosed the affected parser or precise failure operation. Access to the same LAN and no authentication are required, and the documented consequence is service interruption rather than data access or modification.

The record

CVE
CVE-2023-28768
Published
Aug 14, 2023
Updated
Oct 1, 2024
Vendor
Zyxel Networks
Product
XS1930-10 Firmware
Classifications
CWE-755, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 2024Record 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=V4.80(ABQE.1)

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Zyxel Networks · XS1930-10 Firmwareversion=V4.80(ABQE.1)
Zyxel Networks · XGS2220-30 Firmwareversion=V4.80(ABXN.1)
Zyxel Networks · XMG1930-30 Firmwareversion=V4.80(ACAR.1)

Published CVSS scores

6.5Zyxel CorporationCVSS:3.1/AV:A/AC:L/PR:N/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-755Improper Handling of Exceptional Conditions
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo