CVE-2021-44165Network attack vector

Authenticated code execution via web application buffer overflow

Published Dec 14, 2021 · Updated Aug 4, 2024

Stack-based buffer overflow in the Siemens SICAM Q100 web application before 2.41 allows remote authenticated users to execute code. Siemens has not disclosed the affected request, parameter, or memory-copy operation that overruns the stack buffer. Engineer or administrator privileges are required, and successful exploitation executes attacker-controlled code on the meter.

CVSS severity9.1
Critical
EPSS probability2.59%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in the Siemens SICAM Q100 web application before 2.41 allows remote authenticated users to execute code. Siemens has not disclosed the affected request, parameter, or memory-copy operation that overruns the stack buffer. Engineer or administrator privileges are required, and successful exploitation executes attacker-controlled code on the meter.

The record

CVE
CVE-2021-44165
Published
Dec 14, 2021
Updated
Aug 4, 2024
Vendor
Siemens
Product
SICAM Q100
Classifications
CWE-121, T0866
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 14, 2021CVE 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 < V2.41

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Siemens · SICAM Q100version=All versions < V2.41

Published CVSS scores

9.1Siemens ProductCERTCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
9.0NIST NVDAV:N/AC:L/Au:S/C:C/I:C/A:C

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 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
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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