# CVE-2019-8746: Memory corruption in iOS

> A remote attacker can trigger an out-of-bounds read leading to application termination or arbitrary code execution on Apple operating systems.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:** Not needed
- **Fix available:** No
- **Published:** 27 Oct 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-wc35-x492-36g5

## What is CVE-2019-8746?

CVE-2019-8746 is a critical memory corruption vulnerability in Apple Icloud, published on 27 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An out-of-bounds read was addressed with improved input validation. This issue is fixed in macOS Catalina 10.15, iOS 13, iCloud for Windows 7.14, iCloud for Windows 10.7, tvOS 13, macOS Catalina 10.15.1, Security Update 2019-001, and Security Update 2019-006, watchOS 6, iTunes 12.10.1 for Windows. A remote attacker may be able to cause unexpected application termination or arbitrary code execution.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2019-8746?

It affects 6 products.


Products: Apple Icloud, Apple Iphone Os, Apple Itunes, Apple Mac Os X, Apple Tvos, Apple Watchos.

## How do I fix CVE-2019-8746?

No fix has been published for CVE-2019-8746 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-8746 being exploited?

There is no known exploitation of CVE-2019-8746 in the wild and no public exploit code.

## Other vulnerabilities in Apple Icloud

- [CVE-2019-8506](https://insights.sbomify.com/CVE-2019-8506/): Apple Multiple Products Type Confusion (high 8.8, exploited in the wild)
- [CVE-2020-27932](https://insights.sbomify.com/CVE-2020-27932/): Apple Multiple Products Type Confusion (high 7.8, exploited in the wild)
- [CVE-2019-8749](https://insights.sbomify.com/CVE-2019-8749/): Memory corruption in iOS (critical 9.8)
- [CVE-2019-8756](https://insights.sbomify.com/CVE-2019-8756/): Memory corruption in iOS (critical 9.8)
- [CVE-2020-9895](https://insights.sbomify.com/CVE-2020-9895/): Use after free in Safari (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-8746 and fix it if it is affected.

What it is: CVE-2019-8746 is a critical memory corruption vulnerability in Apple Icloud, published on 27 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-8746 in the wild and no public exploit code.

Affected product: Apple Icloud. 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-2019-8746/ (Markdown: https://insights.sbomify.com/CVE-2019-8746/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-8746
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-8746
- OSV: https://osv.dev/vulnerability/CVE-2019-8746

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-8746/
Summaries are generated and may contain mistakes; the official description above is the record.