# CVE-2021-30919: Memory corruption in iOS and iPadOS

> Attackers can execute arbitrary code by tricking users into opening a maliciously crafted PDF on Apple operating systems.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/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:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 24 Aug 2021
- **Updated:** 3 Aug 2024

## What is CVE-2021-30919?

CVE-2021-30919 is a high-severity memory corruption vulnerability in Apple Ipad Os, published on 24 Aug 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

An out-of-bounds write was addressed with improved input validation. This issue is fixed in iOS 15.1 and iPadOS 15.1, macOS Monterey 12.0.1, iOS 14.8.1 and iPadOS 14.8.1, tvOS 15.1, watchOS 8.1, Security Update 2021-007 Catalina, macOS Big Sur 11.6.1. Processing a maliciously crafted PDF may lead to arbitrary code execution.

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

## Which versions are affected by CVE-2021-30919?

It affects 7 products.


Products: Apple Ipad Os, Apple Ipados, Apple Iphone Os, Apple Mac Os X, Apple Macos, Apple Tvos, Apple Watchos.

## How do I fix CVE-2021-30919?

No fix has been published for CVE-2021-30919 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-30919 being exploited?

There is no known exploitation of CVE-2021-30919 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-2021-30919 and fix it if it is affected.

What it is: CVE-2021-30919 is a high-severity memory corruption vulnerability in Apple Ipad Os, published on 24 Aug 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-30919 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-2021-30919/ (Markdown: https://insights.sbomify.com/CVE-2021-30919/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-30919
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-30919
- OSV: https://osv.dev/vulnerability/CVE-2021-30919

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-30919/
Summaries are generated and may contain mistakes; the official description above is the record.