CVE-2016-3949

7.5 highEPSS 4.5%

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.

Severity

CVSS 3.0

7.5 high

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 4.5% chance of exploitation in the next 30 days; higher than 91% of CVEs (scores of 2026-10-31)
CWE: CWE-399
Published: 2016-06-27
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

siemens:simatic_s7-300_with_profitnet_support_firmware
siemens:simatic_s7-300_without_profitnet_support_firmware

References

http://www.securitytracker.com/id/1036089
http://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-818183.pdf
https://cert-portal.siemens.com/productcert/pdf/ssa-818183.pdf
https://ics-cert.us-cert.gov/advisories/ICSA-16-161-01
http://www.securitytracker.com/id/1036089

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