CVE-2022-33138Network attack vector

Unauthenticated data disclosure via unprotected web APIs

Published Jul 12, 2022 · Updated Aug 3, 2024

Missing authentication in Siemens SIMATIC MV500 firmware before 3.3 allows remote attackers to read and download device data. Several web API endpoints return stored device data without checking whether the request carries an authenticated session. Network access to the reader web interface is sufficient; the published impact is data disclosure without integrity or availability effects.

CVSS severity7.5
High
EPSS probability1.31%
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 MV500 firmware before 3.3 allows remote attackers to read and download device data. Several web API endpoints return stored device data without checking whether the request carries an authenticated session. Network access to the reader web interface is sufficient; the published impact is data disclosure without integrity or availability effects.

The record

CVE
CVE-2022-33138
Published
Jul 12, 2022
Updated
Aug 3, 2024
Vendor
Siemens
Product
SIMATIC MV550 H
Classifications
CWE-306, T0819
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 12, 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=All versions < V3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SIMATIC MV550 Hversion=All versions < V3.3
Siemens · SIMATIC MV540 Sversion=All versions < V3.3
Siemens · SIMATIC MV560 Uversion=All versions < V3.3
Siemens · SIMATIC MV560 Xversion=All versions < V3.3
Siemens · SIMATIC MV550 Sversion=All versions < V3.3
Siemens · SIMATIC MV540 Hversion=All versions < V3.3

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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
T0819Exploit Public-Facing Application

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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