CVE-2024-44087Network attack vector

Unauthenticated service crash via body-size integer overflow

Published Sep 10, 2024 · Updated May 13, 2025

Integer overflow in Siemens Automation License Manager V5, V6.0 before SP12 Upd3, and V6.2 before Upd3 allows remote attackers to crash its service. In almsrv64x.exe, adding an attacker-controlled 64-bit body size to the stream position can wrap, bypass the allocated-buffer check, and make the XML parser read beyond accessible memory. The default listener on TCP port 4410 requires no authentication, and process termination can interrupt license verification for dependent products.

CVSS severity8.6
High
EPSS probability10.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Siemens Automation License Manager V5, V6.0 before SP12 Upd3, and V6.2 before Upd3 allows remote attackers to crash its service. In almsrv64x.exe, adding an attacker-controlled 64-bit body size to the stream position can wrap, bypass the allocated-buffer check, and make the XML parser read beyond accessible memory. The default listener on TCP port 4410 requires no authentication, and process termination can interrupt license verification for dependent products.

The record

CVE
CVE-2024-44087
Published
Sep 10, 2024
Updated
May 13, 2025
Vendor
Siemens
Product
Automation License Manager
Classifications
CWE-190, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2024CVE publishedPublication date reported by the CVE source.
  2. May 13, 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=0 <*
  2. Affected versionversion=0 <V6.0 SP12 Upd3
  3. Affected versionversion=0 <V6.2 Upd3
  4. Affected versionversion=5.0 <6.2_upd3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · Automation License Managerversion=0 <*; version=0 <V6.0 SP12 Upd3; version=0 <V6.2 Upd3; version=5.0 <6.2_upd3

Published CVSS scores

8.6Siemens AGCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
9.2Siemens AGCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
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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