CVE-2025-40820

Affected products do not properly enforce TCP sequence number validation in specific scenarios but accept values within a broad range. This could allow an unauthenticated remote attacker e.g. to interfere with connection setup, potentially leading to a denial of service. The attack succeeds only if an attacker can inject IP packets with spoofed addresses at precisely timed moments, and it affects only TCP-based services.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://cert-portal.siemens.com/productcert/html/ssa-915282.html

Configurations

No configuration.

History

30 Sep 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) Los productos afectados no aplican correctamente la validación del número de secuencia TCP en escenarios específicos, sino que aceptan valores dentro de un rango amplio. Esto podría permitir a un atacante remoto no autenticado, por ejemplo, interferir con el establecimiento de la conexión, lo que podría llevar a una denegación de servicio. El ataque solo tiene éxito si un atacante puede inyectar paquetes IP con direcciones falsificadas en momentos precisamente cronometrados, y solo afecta a servicios basados en TCP.

Information

Published : 2025-12-09 16:17

Updated : 2026-10-07 11:10

NVD link : CVE-2025-40820

Mitre link : CVE-2025-40820

CVE.ORG link : CVE-2025-40820

JSON object : View

Products Affected

No product.

CWE

CWE-940

Improper Verification of Source of a Communication Channel

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"V4.4.0", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-1200 CPU 1214C DC/DC/DC", "versions": [{"status": "affected", "version": "0", "lessThan": "V4.4.0", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-1200 CPU 1214C DC/DC/DC", "versions": [{"status": "affected", "version": "0", "lessThan": "V4.4.0", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-1200 CPU 1214C DC/DC/DC", "versions": [{"status": "affected", "version": "0", "lessThan": "V4.4.0", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-1200 CPU 1214C DC/DC/DC RAIL", "versions": [{"status": "affected", "version": "0", "lessThan": "V4.4.0", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-1200 CPU 1214C DC/DC/RLY", "versions": [{"status": "affected", "version": "0", 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"lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1513-1 PN", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1513F-1 PN", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1516-3 PN/DP", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1516-3 PN/DP", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1516F-3 PN/DP", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-300 CPU 314C-2 PN/DP", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-300 CPU 315-2 PN/DP", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-300 CPU 315F-2 PN/DP", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-300 CPU 317-2 PN/DP", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-300 CPU 317F-2 PN/DP", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-400 CPU 414-3 PN/DP V7", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIPLUS S7-400 CPU 416-3 PN/DP V7", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIWAREX WP231", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIWAREX WP241", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIWAREX WP251", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIWAREX WP521 ST", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}, {"vendor": "Siemens", "product": "SIWAREX WP522 ST", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}]}], "published": "2025-12-09T16:17:46.413", "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-915282.html", "source": "productcert@siemens.com"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "productcert@siemens.com", "description": [{"lang": "en", "value": "CWE-940"}]}], "descriptions": [{"lang": "en", "value": "Affected products do not properly enforce TCP sequence number validation in specific scenarios but accept values within a broad range. This could allow an unauthenticated remote attacker e.g. to interfere with connection setup, potentially leading to a denial of service. The attack succeeds only if an attacker can inject IP packets with spoofed addresses at precisely timed moments, and it affects only TCP-based services."}, {"lang": "es", "value": "Los productos afectados no aplican correctamente la validaci\u00f3n del n\u00famero de secuencia TCP en escenarios espec\u00edficos, sino que aceptan valores dentro de un rango amplio. Esto podr\u00eda permitir a un atacante remoto no autenticado, por ejemplo, interferir con el establecimiento de la conexi\u00f3n, lo que podr\u00eda llevar a una denegaci\u00f3n de servicio. El ataque solo tiene \u00e9xito si un atacante puede inyectar paquetes IP con direcciones falsificadas en momentos precisamente cronometrados, y solo afecta a servicios basados en TCP."}], "lastModified": "2026-10-07T11:10:00.153", "sourceIdentifier": "productcert@siemens.com"}