CVE-2024-21483

Physical flash-data disclosure via unset readout protection

Published Mar 12, 2024 · Updated Apr 15, 2025

Improper access control in Siemens SENTRON 7KM PAC3x20 firmware 3.2.3 allows physically proximate attackers to read internal flash data. Manufacturing left the internal-flash readout-protection setting disabled on devices from production lots dated LQN231003 through LQN231215. Physical possession of an affected meter is required; exposure is limited to reading stored data, with no reported ability to modify it or interrupt operation.

CVSS severity4.6
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Siemens SENTRON 7KM PAC3x20 firmware 3.2.3 allows physically proximate attackers to read internal flash data. Manufacturing left the internal-flash readout-protection setting disabled on devices from production lots dated LQN231003 through LQN231215. Physical possession of an affected meter is required; exposure is limited to reading stored data, with no reported ability to modify it or interrupt operation.

The record

CVE
CVE-2024-21483
Published
Mar 12, 2024
Updated
Apr 15, 2025
Vendor
Siemens
Product
SENTRON 7KM PAC3220 DC
Classifications
CWE-284
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2025Record 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=V3.2.3 <V3.2.4

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Siemens · SENTRON 7KM PAC3220 DCversion=V3.2.3 <V3.2.4
Siemens · SENTRON 7KM PAC3220 AC/DCversion=V3.2.3 <V3.2.4
Siemens · SENTRON 7KM PAC3120 DCversion=V3.2.3 <V3.2.4
Siemens · SENTRON 7KM PAC3120 AC/DCversion=V3.2.3 <V3.2.4

Published CVSS scores

5.1Siemens AGCVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
4.6Siemens AGCVSS:3.1/AV:P/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)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control

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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