CVE-2022-43392Network attack vector

Authenticated device crash via authorization request overflow

Published Jan 11, 2023 · Updated Nov 27, 2024

Buffer overflow in Zyxel NR7101 Firmware before V1.15(ACCC.3)C0 allows remote authenticated users to crash the device. Zyxel identifies an authorization-request parameter in the web server but has not disclosed the affected routine or the exact unchecked copy operation. Valid management credentials and network access to the web interface are required; WAN access is disabled by default on most affected devices.

CVSS severity6.5
Medium
EPSS probability0.62%
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 NR7101 Firmware before V1.15(ACCC.3)C0 allows remote authenticated users to crash the device. Zyxel identifies an authorization-request parameter in the web server but has not disclosed the affected routine or the exact unchecked copy operation. Valid management credentials and network access to the web interface are required; WAN access is disabled by default on most affected devices.

The record

CVE
CVE-2022-43392
Published
Jan 11, 2023
Updated
Nov 27, 2024
Vendor
Zyxel Networks
Product
NR7101 Firmware
Classifications
CWE-120, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 27, 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=< V1.15(ACCC.3)C0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zyxel Networks · NR7101 Firmwareversion=< V1.15(ACCC.3)C0

Published CVSS scores

6.5Zyxel CorporationCVSS:3.1/AV:N/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.

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499Endpoint Denial 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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