CVE-2021-22744

Module reset via malformed TriStation packets

Published May 26, 2021 · Updated Aug 3, 2024

Improper condition handling in Schneider Electric Triconex Model 3009 MP on Tricon 11.3.x allows physically proximate attackers to reset the module. The TCM accepts malformed TriStation packets without correctly handling exceptional conditions, causing the 3009 MP module to reset. Physical access and the write-protect keyswitch in the program position are required, and the documented consequence is a temporary availability loss.

CVSS severity3.9
Low
EPSS probability0.25%
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 Schneider Electric Triconex Model 3009 MP on Tricon 11.3.x allows physically proximate attackers to reset the module. The TCM accepts malformed TriStation packets without correctly handling exceptional conditions, causing the 3009 MP module to reset. Physical access and the write-protect keyswitch in the program position are required, and the documented consequence is a temporary availability loss.

The record

CVE
CVE-2021-22744
Published
May 26, 2021
Updated
Aug 3, 2024
Vendor
Schneider Electric
Product
Triconex Model 3009 MP Firmware
Classifications
CWE-754, T0814
Attack vector
physical
Privileges
admin

Timeline

How it unfolded

  1. May 26, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=Triconex Model 3009 MP installed on Tricon V11.3.x systems

What conditions does exploitation require?

Attack vectorphysical
Required privilegesadmin

What is affected?

Schneider Electric · Triconex Model 3009 MP Firmwareversion=Triconex Model 3009 MP installed on Tricon V11.3.x systems

Published CVSS scores

3.9NIST NVDCVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:P

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)
Vectorphysical
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
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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