CVE-2022-3166Network attack vector

Web-server service interruption via abrupt TCP closure

Published Dec 16, 2022 · Updated Apr 17, 2025

Denial of service in Rockwell Automation MicroLogix 1100 and 1400 web servers allows remote attackers to interrupt HTTP service. The web server mishandles TCP sessions that a client closes abruptly after sending packets, leaving the web application unavailable. The documented consequence is limited to the device's web-server application, and the optional HTTP component must be enabled and network-accessible.

CVSS severity7.5
High
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Rockwell Automation MicroLogix 1100 and 1400 web servers allows remote attackers to interrupt HTTP service. The web server mishandles TCP sessions that a client closes abruptly after sending packets, leaving the web application unavailable. The documented consequence is limited to the device's web-server application, and the optional HTTP component must be enabled and network-accessible.

The record

CVE
CVE-2022-3166
Published
Dec 16, 2022
Updated
Apr 17, 2025
Vendor
Rockwell Automation
Product
MicroLogix 1400
Classifications
CWE-924, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 16, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 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=21.007 and below
  2. Affected versionversion=7.000 and below

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rockwell Automation · MicroLogix 1400version=21.007 and below; version=7.000 and below
Rockwell Automation · MicroLogix 1100version=All

Published CVSS scores

7.5Rockwell AutomationCVSS:3.1/AV:N/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 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-924Improper Enforcement of Message Integrity During Transmission in a Communication Channel
T0814Denial of Service

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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