CVE-2023-43504Network attack vector

Code execution via ptmcast SEH buffer overflow

Published Nov 14, 2023 · Updated Jan 8, 2025

Classic buffer overflow in Siemens COMOS before 10.4.4 allows remote attackers to execute code or crash the application via ptmcast. The ptmcast cache-validation test executable copies attacker-controlled data without adequate bounds checking, corrupting its Structured Exception Handler chain. Exploitation requires user interaction; successful memory corruption can run code in the target process or terminate it.

CVSS severity9.6
Critical
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Classic buffer overflow in Siemens COMOS before 10.4.4 allows remote attackers to execute code or crash the application via ptmcast. The ptmcast cache-validation test executable copies attacker-controlled data without adequate bounds checking, corrupting its Structured Exception Handler chain. Exploitation requires user interaction; successful memory corruption can run code in the target process or terminate it.

The record

CVE
CVE-2023-43504
Published
Nov 14, 2023
Updated
Jan 8, 2025
Vendor
Siemens
Product
COMOS
Classifications
CWE-120, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 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=All versions < V10.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · COMOSversion=All versions < V10.4.4

Published CVSS scores

9.6Siemens AGCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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