CVE-2021-44222Network attack vector

Unauthenticated system requests via unprotected MQTT messaging

Published Jul 12, 2022 · Updated Aug 4, 2024

Missing authentication in Siemens SIMATIC eaSie Core Package before 22.00 allows unauthenticated remote attackers to issue arbitrary system requests. The underlying MQTT service accepts arbitrary published messages without authenticating clients when the default configuration is used. Network access to that service is sufficient to submit messages that the system processes as requests, affecting confidentiality and integrity without a reported availability impact.

CVSS severity9.1
Critical
EPSS probability1.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Siemens SIMATIC eaSie Core Package before 22.00 allows unauthenticated remote attackers to issue arbitrary system requests. The underlying MQTT service accepts arbitrary published messages without authenticating clients when the default configuration is used. Network access to that service is sufficient to submit messages that the system processes as requests, affecting confidentiality and integrity without a reported availability impact.

The record

CVE
CVE-2021-44222
Published
Jul 12, 2022
Updated
Aug 4, 2024
Vendor
Siemens
Product
SIMATIC eaSie Core Package
Classifications
CWE-306, T0866
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 12, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=All versions < V22.00

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SIMATIC eaSie Core Packageversion=All versions < V22.00

Published CVSS scores

6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:N
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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-306Missing Authentication for Critical Function
T0866Exploitation of Remote Services

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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