CVE-2022-22724Network attack vector

Unauthenticated service interruption via TCP reset flood

Published Feb 4, 2022 · Updated Aug 3, 2024

Resource exhaustion in all Schneider Electric Modicon M340 BMXP34 CPU versions allows remote attackers to interrupt HTTP and Modbus services. The PLC Ethernet stack fails to control resource consumption when any open TCP port receives a large volume of RST or FIN packets. Network reachability to an open TCP port is sufficient; the documented consequence is denial of service on ports 80 and 502.

CVSS severity7.5
High
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in all Schneider Electric Modicon M340 BMXP34 CPU versions allows remote attackers to interrupt HTTP and Modbus services. The PLC Ethernet stack fails to control resource consumption when any open TCP port receives a large volume of RST or FIN packets. Network reachability to an open TCP port is sufficient; the documented consequence is denial of service on ports 80 and 502.

The record

CVE
CVE-2022-22724
Published
Feb 4, 2022
Updated
Aug 3, 2024
Vendor
Schneider Electric
Product
Modicon M340 PAC
Classifications
CWE-400, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 4, 2022CVE 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=Modicon M340 CPUs: BMXP34 (All Versions)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Schneider Electric · Modicon M340 PACversion=Modicon M340 CPUs: BMXP34 (All Versions)

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
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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