CVE-2022-45789Network attack vector

Unauthorized Modbus functions via replayed authenticated sessions

Published Jan 31, 2023 · Updated May 29, 2026

Authentication bypass in all Schneider Electric Modicon and EcoStruxure versions allows remote attackers to run unauthorized Modbus functions. The UMAS EnhancedCyberReserve mechanism binds requests to public, globally reusable nonces, omits a secret from request signing, and provides no per-request freshness. Network access that permits capture of an authenticated Modbus session is required; replayed traffic invokes controller functions with the captured session's authority.

CVSS severity8.1
High
EPSS probability1.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in all Schneider Electric Modicon and EcoStruxure versions allows remote attackers to run unauthorized Modbus functions. The UMAS EnhancedCyberReserve mechanism binds requests to public, globally reusable nonces, omits a secret from request signing, and provides no per-request freshness. Network access that permits capture of an authenticated Modbus session is required; replayed traffic invokes controller functions with the captured session's authority.

The record

CVE
CVE-2022-45789
Published
Jan 31, 2023
Updated
May 29, 2026
Vendor
Distributed Data Systems
Product
EcoStruxure Control Expert
Classifications
CWE-294, T0830
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 31, 2023CVE publishedPublication date reported by the CVE source.
  2. May 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=All Versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Distributed Data Systems · EcoStruxure Control Expertversion=All Versions
Distributed Data Systems · Modicon M580 Safety CPUversion=All Versions
Distributed Data Systems · Modicon M580 CPUversion=All Versions
Distributed Data Systems · Modicon M340 CPUversion=All Versions
Distributed Data Systems · EcoStruxure Process Expertversion=All Versions

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1Schneider Electric SECVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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.

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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-294Authentication Bypass by Capture-replay
T0830Adversary-in-the-Middle

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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