Siemens SIMATIC S7-300 Firmware Security Update

Number: AV16-095
Date: 11 June 2016


The purpose of this advisory is to bring attention to a SIMATIC S7-300 security update released by Siemens.


Siemens released a security update for the SIMATIC S7-300 to address a critical vulnerability.  An attacker could remotely exploit these vulnerabilities to cause denial-of-service conditions.

Affected versions:
Siemens SIMATIC S7-300 with Profinet support prior to version 3.2.12
Siemens SIMATIC S7-300 without Profinet support prior to version 3.3.12

CVE References: CVE-2016-3949

Suggested action

CCIRC recommends that system administrators test and deploy the vendor-released updates to affected applications accordingly.


Siemens Advisory SSA-818183:

Note to Readers

In support of Public Safety's mission to build a safe and resilient Canada, CCIRC's mandate is to help ensure the security and resilience of the vital non-federal government cyber systems that underpin Canada's national security, public safety and economic prosperity. As Canada's computer security incident response team, CCIRC is Canada's national coordination centre for the prevention and mitigation of, preparedness for, response to, and recovery from cyber incidents on non-federal government systems. It does this by providing authoritative advice and support, and coordinating information sharing and incident response.

Please note, CCIRC PGP key has recently been updated.

For general information, please contact Public Safety Canada's Public Affairs division at:

Telephone: 613-944-4875 or 1-800-830-3118
Fax: 613-998-9589

Date modified: