THREATPORT/VULNERABILITY/CVE-2016-3949
HIGH SEVERITY

CVE-2016-3949

Simatic S7 300 With Profitnet Support Firmware vulnerability

CVSS
7.5
EPSS
4.5%
EPSS pct
90th
Exploited
No known
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 vendor
Siemens
Affected product
Simatic S7 300 With Profitnet Support Firmware
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness type (CWE)
Published
2016-06-27

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to availability.

Its EPSS score of 4.5% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 90% of all scored CVEs.

Check your external exposure to CVE-2016-3949

  • Confirm whether Siemens Simatic S7 300 With Profitnet Support Firmware is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2016-3949.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2016-3949

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2016-3949 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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