Attacker Value
Unknown
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Exploitability
Unknown
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User Interaction
Unknown
Privileges Required
Unknown
Attack Vector
Unknown
0

CVE-2018-16561

Disclosure Date: April 17, 2019
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Description

A vulnerability has been identified in SIMATIC S7-300 CPUs (All versions < V3.X.16). The affected CPUs improperly validate S7 communication packets which could cause a Denial-of-Service condition of the CPU. The CPU will remain in DEFECT mode until manual restart. Successful exploitation requires an attacker to be able to send a specially crafted S7 communication packet to a communication interface of the CPU. This includes Ethernet, PROFIBUS, and Multi Point Interfaces (MPI). No user interaction or privileges are required to exploit the security vulnerability. The vulnerability could allow causing a Denial-of-Service condition of the core functionality of the CPU, compromising the availability of the system. At the time of advisory publication no public exploitation of this security vulnerability was known. Siemens confirms the security vulnerability and provides mitigations to resolve the security issue.

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CVSS V3 Severity and Metrics
Base Score:
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Impact Score:
Unknown
Exploitability Score:
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Vector:
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Attack Vector (AV):
Unknown
Attack Complexity (AC):
Unknown
Privileges Required (PR):
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User Interaction (UI):
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Scope (S):
Unknown
Confidentiality (C):
Unknown
Integrity (I):
Unknown
Availability (A):
Unknown

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Technical Analysis