# CVE-2019-8743: Memory corruption in watchOS

> Attackers can execute arbitrary code on Apple Watch devices by tricking users into viewing maliciously crafted web content.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 18 Dec 2019
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2019-8743, GHSA-vwxq-9822-h934, UBUNTU-CVE-2019-8743

## What is CVE-2019-8743?

CVE-2019-8743 is a high-severity memory corruption vulnerability in Apple Watchos, published on 18 Dec 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Multiple memory corruption issues were addressed with improved memory handling. This issue is fixed in watchOS 6.1. Processing maliciously crafted web content may lead to arbitrary code execution.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2019-8743?

It affects 1 product.


Products: Apple Watchos.

## How do I fix CVE-2019-8743?

Upgrade to a fixed version.

## Is CVE-2019-8743 being exploited?

There is no known exploitation of CVE-2019-8743 in the wild and no public exploit code.

## Other vulnerabilities in Apple Watchos

- [CVE-2019-8765](https://insights.sbomify.com/CVE-2019-8765/): Memory corruption in watchOS (high 8.8)
- [CVE-2020-3834](https://insights.sbomify.com/CVE-2020-3834/): Memory corruption in watchOS (high 7.8)
- [CVE-2019-8747](https://insights.sbomify.com/CVE-2019-8747/): Memory corruption in watchOS (high 7.8)
- [CVE-2019-8624](https://insights.sbomify.com/CVE-2019-8624/): Information disclosure in watchOS (high 7.5)
- [CVE-2019-8659](https://insights.sbomify.com/CVE-2019-8659/): Business logic in watchOS (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-8743 and fix it if it is affected.

What it is: CVE-2019-8743 is a high-severity memory corruption vulnerability in Apple Watchos, published on 18 Dec 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2019-8743 in the wild and no public exploit code.

Affected product: Apple Watchos. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2019-8743/ (Markdown: https://insights.sbomify.com/CVE-2019-8743/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-8743
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-8743
- OSV: https://osv.dev/vulnerability/CVE-2019-8743

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-8743/
Summaries are generated and may contain mistakes; the official description above is the record.