CVE-2016-3949

Name: CVE-2016-3949
Creator: NVD / NIST
Published: 2016-06-27T10:59:06.58+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 4.49%

Last modified Jun 17, 2026

CVE-2016-3949 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 4.49% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

4.49%

90.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-399

Affected Software

Vendor	Product	Versions
Siemens	Simatic S7-300 With Profitnet Support Firmware	3.2.11
Siemens	Simatic S7-300 Without Profitnet Support Firmware	3.3.11

References

http://www.securitytracker.com/id/1036089Third Party Advisory, VDB Entry
http://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-818183.pdfVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-818183.pdf
https://ics-cert.us-cert.gov/advisories/ICSA-16-161-01Mitigation, Third Party Advisory, US Government Resource
http://www.securitytracker.com/id/1036089Third Party Advisory, VDB Entry
http://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-818183.pdfVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-818183.pdf
https://ics-cert.us-cert.gov/advisories/ICSA-16-161-01Mitigation, Third Party Advisory, US Government Resource

Timeline

Published: Jun 27, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-3949?

How severe is CVE-2016-3949?

Severity scoring for CVE-2016-3949 is pending analysis. The EPSS model estimates a 4.49% probability of exploitation in the next 30 days.

How do I fix CVE-2016-3949?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-3949?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST