CVE-2016-3949: n/a vulnerability

CVE-2016-3949: Siemens SIMATIC S7-300 Profinet-enabled CPU devices with firmware before 3.2.12 and SIMATIC S7-300 Profinet...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 00:10 UTC (UTC+00:00)

Security readout for executives and security teams

This flaw can let a remote attacker force certain Siemens SIMATIC S7-300 CPUs into a denial-of-service defect mode. For an executive, the concern is operational disruption in industrial environments, not data theft. The source bundle identifies fixed firmware thresholds, but does not provide CVSS, CWE, or evidence of active exploitation. Exposure is likely limited to organizations operating Siemens SIMATIC S7-300 PLC CPUs, especially legacy industrial sites with reachable ISO-TSAP or Profibus communications paths. Internet exposure is not established by the bundle. Prioritize remediation where affected PLCs support production, safety-adjacent, or availability-critical processes. The main business risk is process interruption from PLC denial of service. Mitigation focus: Inventory SIMATIC S7-300 CPUs and record firmware versions.; Upgrade Profinet-enabled CPUs to firmware 3.2.12 or later.; Upgrade Profinet-disabled CPUs to firmware 3.3.12 or later..

Prepared: Jun 13, 2026, 14:22 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jun 27, 2016, 10:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://ics-cert.us-cert.gov/advisories/ICSA-16-161-01CVE reference · x_refsource_MISC
https://cert-portal.siemens.com/productcert/pdf/ssa-818183.pdfCVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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