Siemens SIMATIC S7-300 Profinet-enabled CPU devices with firmware before 3.2.12 and SIMATIC S7-300 Profinet-disabled CPU devices with firmware before 3.3.12 allow remote attackers to cause a denial of service (defect-mode transition) via crafted (1) ISO-TSAP or (2) Profibus packets.

Siemens SIMATIC S7-300 Profinet-enabled CPU devices with firmware before 3.2.12 and SIMATIC S7-300 Profinet-disabled CPU devices with firmware before 3.3.12 allow remote attackers to cause a denial of service (defect-mode transition) via crafted (1) ISO-TSAP or (2) Profibus packets. 

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Siemens S7-300 PLC central processing units (CPUs) contain an unspecified flaw that may allow a remote attacker to use a specially crafted packet to cause the device to enter defect mode until a cold restart is performed.

Siemens S7-300 central processing units (CPUs) with Profinet support less than version 3.2.12 and without Profinet support less than version 3.3.12 have a vulnerability which could allow a remote attacker to cause a Denial of Service condition. The attack involves sending specially crafted packets to 102/TCP and could cause the device to go into defect mode. A cold restart is required to recover the system.

ID	Name	Product	Family	Severity
500326	Siemens SIMATIC S7-300 Denial of Service (CVE-2016-3949)	Tenable OT Security	Tenable.ot	high
32	Siemens S7-300 Series PLC CPU Firmware <= 3.2.11 DoS	Nessus Network Monitor	SCADA	high
221	Siemens S7-300 Denial of Service Vulnerability	Nessus Network Monitor	SCADA	high
7225	Siemens S7-300 Series PLC CPU Firmware <= 3.2.11 DoS	Nessus Network Monitor	SCADA	high

Detections

Analytics

CVE-2016-3949

high

Tenable Plugins

high

high

high

high