# CVE-2018-4474: Denial of service in Safari

> An unexpected interaction causes an assertion failure leading to memory consumption and denial of service in Apple Safari and related applications.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:** 5 Aug 2024
- **Also known as:** GHSA-jr79-gh2g-m9rv

## What is CVE-2018-4474?

CVE-2018-4474 is a high-severity denial of service 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

A memory consumption issue was addressed with improved memory handling. This issue is fixed in iCloud for Windows 7.7, watchOS 5, Safari 12, iOS 12, iTunes 12.9 for Windows, tvOS 12. Unexpected interaction causes an ASSERT failure.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2018-4474?

It affects 6 products.


Products: Apple Icloud, Apple Iphone Os, Apple Itunes, Apple Safari, Apple Tvos, Apple Watchos.

## How do I fix CVE-2018-4474?

No fix has been published for CVE-2018-4474 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-4474 being exploited?

There is no known exploitation of CVE-2018-4474 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-2019-8746](https://insights.sbomify.com/CVE-2019-8746/): Memory corruption in iOS (critical 9.8)
- [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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-4474 and fix it if it is affected.

What it is: CVE-2018-4474 is a high-severity denial of service 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-2018-4474 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-2018-4474/ (Markdown: https://insights.sbomify.com/CVE-2018-4474/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-4474
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-4474
- OSV: https://osv.dev/vulnerability/CVE-2018-4474

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-4474/
Summaries are generated and may contain mistakes; the official description above is the record.