# CVE-2021-1801: Security feature bypass in iOS and iPadOS

> Attackers can bypass iframe sandboxing policies via malicious web content, potentially exposing sensitive data or executing code in restricted contexts.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N`)
- **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:** 2 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** DEBIAN-CVE-2021-1801, GHSA-99vx-wqpw-hqrq, UBUNTU-CVE-2021-1801

## What is CVE-2021-1801?

CVE-2021-1801 is a medium-severity vulnerability in Apple Ipad Os, published on 2 Apr 2021. 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

This issue was addressed with improved iframe sandbox enforcement. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4. Maliciously crafted web content may violate iframe sandboxing policy.

## Which versions are affected by CVE-2021-1801?

It affects 7 products.


Products: Apple Ipad Os, Apple Iphone Os, Apple Macos, Apple Tvos, Apple Watchos, Fedoraproject Fedora, Webkitgtk Webkitgtk.

## How do I fix CVE-2021-1801?

Upgrade to a fixed version.

## Is CVE-2021-1801 being exploited?

There is no known exploitation of CVE-2021-1801 in the wild and no public exploit code.

## Other vulnerabilities in Apple Ipad Os

- [CVE-2021-1794](https://insights.sbomify.com/CVE-2021-1794/): Memory corruption in iOS and iPadOS (critical 9.8)
- [CVE-2021-1795](https://insights.sbomify.com/CVE-2021-1795/): Memory corruption in iOS and iPadOS (critical 9.8)
- [CVE-2021-1796](https://insights.sbomify.com/CVE-2021-1796/): Memory corruption in iOS and iPadOS (critical 9.8)
- [CVE-2021-1818](https://insights.sbomify.com/CVE-2021-1818/): Memory corruption in iOS and iPadOS (critical 9.8)
- [CVE-2024-23255](https://insights.sbomify.com/CVE-2024-23255/): Auth bypass in iOS and iPadOS (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-1801 and fix it if it is affected.

What it is: CVE-2021-1801 is a medium-severity vulnerability in Apple Ipad Os, published on 2 Apr 2021. 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-2021-1801 in the wild and no public exploit code.

Affected product: Apple Ipad Os. 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-2021-1801/ (Markdown: https://insights.sbomify.com/CVE-2021-1801/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-1801
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-1801
- OSV: https://osv.dev/vulnerability/CVE-2021-1801

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-1801/
Summaries are generated and may contain mistakes; the official description above is the record.