CVE-2021-32970Network attack vector

Unauthenticated service interruption via unvalidated data copy

Published Apr 1, 2022 · Updated Apr 16, 2025

Improper input validation in the web server in Moxa NPort IAW5000A-I/O Series firmware 2.2 and earlier allows remote attackers to interrupt service. The built-in web server copies attacker-controlled data without validation, but Moxa has not disclosed the affected request handler or specific failure mode. The interface is network-reachable without authentication; the documented consequence is availability loss only, with no reported data access, modification, or code execution for this CVE.

CVSS severity7.5
High
EPSS probability1.69%
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 web server in Moxa NPort IAW5000A-I/O Series firmware 2.2 and earlier allows remote attackers to interrupt service. The built-in web server copies attacker-controlled data without validation, but Moxa has not disclosed the affected request handler or specific failure mode. The interface is network-reachable without authentication; the documented consequence is availability loss only, with no reported data access, modification, or code execution for this CVE.

The record

CVE
CVE-2021-32970
Published
Apr 1, 2022
Updated
Apr 16, 2025
Vendor
Moxa
Product
NPort IAW5000A-I/O Series
Classifications
CWE-20, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 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=unspecified <=2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Moxa · NPort IAW5000A-I/O Seriesversion=unspecified <=2.2

Published CVSS scores

7.5ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.8NIST NVDAV:N/AC:L/Au:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
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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