CVE-2022-43393Network attack vector

Unauthenticated denial of service via unusual HTTP requests

Published Jan 11, 2023 · Updated Apr 8, 2025

Improper condition handling in Zyxel GS1920-24v2 firmware before V4.70(ABMH.8)C0 allows remote attackers to interrupt service. The HTTP request processing function fails to handle unusual or exceptional request conditions, permitting request-driven memory corruption. No authentication is required, but the management interface must accept HTTP or HTTPS requests from the attacker’s network position.

CVSS severity8.2
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper condition handling in Zyxel GS1920-24v2 firmware before V4.70(ABMH.8)C0 allows remote attackers to interrupt service. The HTTP request processing function fails to handle unusual or exceptional request conditions, permitting request-driven memory corruption. No authentication is required, but the management interface must accept HTTP or HTTPS requests from the attacker’s network position.

The record

CVE
CVE-2022-43393
Published
Jan 11, 2023
Updated
Apr 8, 2025
Vendor
Zyxel Networks
Product
GS1920-24v2 firmware
Classifications
CWE-754, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2025Record 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=< V4.70(ABMH.8)C0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zyxel Networks · GS1920-24v2 firmwareversion=< V4.70(ABMH.8)C0

Published CVSS scores

8.2Zyxel NetworksCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or 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

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Your stack

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