# CVE-2020-3862: Denial of service in Safari

> A malicious website can cause a denial of service in Apple Safari and related applications due to improper memory handling.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 27 Feb 2020
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2020-3862, GHSA-vq6g-4p44-h8hq, UBUNTU-CVE-2020-3862

## What is CVE-2020-3862?

CVE-2020-3862 is a medium-severity denial of service vulnerability in Apple Icloud, published on 27 Feb 2020. 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

A denial of service issue was addressed with improved memory handling. This issue is fixed in iOS 13.3.1 and iPadOS 13.3.1, tvOS 13.3.1, Safari 13.0.5, iTunes for Windows 12.10.4, iCloud for Windows 11.0, iCloud for Windows 7.17. A malicious website may be able to cause a denial of service.

## Which versions are affected by CVE-2020-3862?

It affects 7 products.


Products: Apple Icloud, Apple Ipados, Apple Iphone Os, Apple Itunes, Apple Safari, Apple Tvos, Opensuse Leap.

## How do I fix CVE-2020-3862?

Upgrade to a fixed version.

## Is CVE-2020-3862 being exploited?

There is no known exploitation of CVE-2020-3862 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-2020-3862 and fix it if it is affected.

What it is: CVE-2020-3862 is a medium-severity denial of service vulnerability in Apple Icloud, published on 27 Feb 2020. 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-2020-3862 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-2020-3862/ (Markdown: https://insights.sbomify.com/CVE-2020-3862/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3862
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3862
- OSV: https://osv.dev/vulnerability/CVE-2020-3862

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-3862/
Summaries are generated and may contain mistakes; the official description above is the record.