CVE-2024-22040Network attack vector

Network-service crash via insufficient HMAC validation

Published Mar 12, 2024 · Updated Dec 16, 2025

Out-of-bounds read in Siemens fire-system products allows remote attackers to crash the network service with crafted HMAC values. The shared network communication library fails to validate HMAC values before reading a buffer, so malformed authentication data triggers an overread. Access to the fire protection system network is required; engineering tools and Sinteso Mobile additionally require an on-path position, and the consequence is limited to the affected service, tool, or app.

CVSS severity7.5
High
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Siemens fire-system products allows remote attackers to crash the network service with crafted HMAC values. The shared network communication library fails to validate HMAC values before reading a buffer, so malformed authentication data triggers an overread. Access to the fire protection system network is required; engineering tools and Sinteso Mobile additionally require an on-path position, and the consequence is limited to the affected service, tool, or app.

The record

CVE
CVE-2024-22040
Published
Mar 12, 2024
Updated
Dec 16, 2025
Vendor
Siemens
Product
Cerberus PRO UL X300 Cloud Distribution
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=*
  2. Affected versionversion=0 <V4.3.0001

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · Cerberus PRO UL X300 Cloud Distributionversion=*; version=0 <V4.3.0001
Siemens · Sinteso FS20 EN X300 Cloud Distribution MP8version=0 <V4.3.5617
Siemens · Cerberus PRO EN X200 Cloud Distribution IP8version=0 <V4.3.5618
Siemens · Sinteso FS20 EN Fire Panel FC20 MP6version=0 <*
Siemens · Cerberus PRO EN Fire Panel FC72xversion=-
Siemens · Desigo Fire Safety UL X300 Cloud Distributionversion=0 <V4.3.0001
Siemens · Cerberus PRO EN Fire Panel FC72x IP8version=0 <IP8 SR4
Siemens · Cerberus PRO EN Fire Panel FC72x IP6version=0 <*
Siemens · Sinteso FS20 EN X200 Cloud Distribution MP8version=0 <V4.3.5618
Siemens · Cerberus PRO EN X200 Cloud Distributionversion=-
Siemens · Desigo Fire Safety UL Engineering Toolversion=0 <MP4; version=0 <v4.3.0001
Siemens · Sinteso FS20 EN X200 Cloud Distributionversion=*
Siemens · Sinteso Mobileversion=*; version=0 <*
Siemens · Sinteso FS20 EN X300 Cloud Distributionversion=*
Siemens · Cerberus PRO EN X300 Cloud Distribution IP8version=0 <V4.3.5617
Siemens · Cerberus PRO UL Compact Panel FC922/924version=*; version=0 <MP4
Siemens · Cerberus PRO UL Engineering Toolversion=*; version=0 <MP4
Siemens · Sinteso FS20 EN X300 Cloud Distribution MP7version=0 <*
Siemens · Sinteso FS20 EN Fire Panel FC20 MP7version=0 <*
Siemens · Cerberus PRO EN X200 Cloud Distribution IP7version=0 <*
Siemens · Cerberus PRO EN X300 Cloud Distributionversion=-
Siemens · Sinteso FS20 EN Fire Panel FC20version=-
Siemens · Cerberus PRO EN Engineering Toolversion=-; version=0 <*
Siemens · Sinteso FS20 EN Engineering Toolversion=*; version=0 <*
Siemens · Cerberus PRO EN X300 Cloud Distribution IP7version=0 <*
Siemens · Cerberus PRO EN Fire Panel FC72x IP7version=0 <*
Siemens · Sinteso FS20 EN Fire Panel FC20 MP8version=0 <MP8 SR4
Siemens · Sinteso FS20 EN X200 Cloud Distribution MP7version=0 <*
Siemens · Desigo Fire Safety UL Compact Panel FC2025/2050version=0 <mp4; version=0 <MP4

Published CVSS scores

8.7Siemens ProductCERTCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5Siemens AGCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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