What’s Vulnerable › Vulnerabilities

CVE-2016-3949

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2016-06-27 · updated 2026-06-17
• Weakness: CWE-399

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.

Affected products

• 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/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
• 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

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