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HIGH · 7.5

CVE-2018-16561

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 t...

Vulnerability 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.

CVSS Score

7.5

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
SiemensSimatic S7-300 Firmware-
SiemensSimatic S7-300-
SiemensSimatic S7-300F Firmware-
SiemensSimatic S7-300F-
SiemensSimatic S7-300Fs Firmware-
SiemensSimatic S7-300Fs-
SiemensSimatic S7-300T Firmware-
SiemensSimatic S7-300T-

References

FAQ

What is CVE-2018-16561?

CVE-2018-16561 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 t...

How severe is CVE-2018-16561?

CVE-2018-16561 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2018-16561?

Check the references section above for vendor advisories and patch information. Affected products include: Siemens Simatic S7-300 Firmware, Siemens Simatic S7-300, Siemens Simatic S7-300F Firmware, Siemens Simatic S7-300F, Siemens Simatic S7-300Fs Firmware.