# CVE-2019-8662: Use after free in iOS

> An attacker can trigger a use-after-free in applications deserializing untrusted data, potentially leading to code execution on Apple devices.

- **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:** 18 Dec 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-v448-6mjx-mr34

## What is CVE-2019-8662?

CVE-2019-8662 is a critical use after free vulnerability in Apple Iphone Os, published on 18 Dec 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

This issue was addressed with improved checks. This issue is fixed in iOS 12.4, macOS Mojave 10.14.6, tvOS 12.4, watchOS 5.3. An attacker may be able to trigger a use-after-free in an application deserializing an untrusted NSDictionary.

Weakness: CWE-502 (Deserialization of Untrusted Data), CWE-416 (Use After Free)

## Which versions are affected by CVE-2019-8662?

It affects 4 products.


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

## How do I fix CVE-2019-8662?

No fix has been published for CVE-2019-8662 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-8662 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-8662 exists.

Public exploit code:

- macOS / iOS NSKeyedUnarchiver - Use-After-Free of ObjC Objects when Unarchiving OITSUIntDictionary Instances (exploitdb)
- iMessage - Decoding NSSharedKeyDictionary can read ObjC Object at Attacker Controlled Address (exploitdb)

## Other vulnerabilities in Apple Iphone Os

- [CVE-2021-30666](https://insights.sbomify.com/CVE-2021-30666/): Apple iOS WebKit Buffer Overflow (high 8.8, exploited in the wild)
- [CVE-2021-30761](https://insights.sbomify.com/CVE-2021-30761/): Apple iOS WebKit Memory Corruption (high 8.8, exploited in the wild)
- [CVE-2021-30762](https://insights.sbomify.com/CVE-2021-30762/): Apple iOS WebKit Use-After-Free (high 8.8, exploited in the wild)
- [CVE-2016-4657](https://insights.sbomify.com/CVE-2016-4657/): Apple iOS Webkit Memory Corruption (high 8.8, exploited in the wild)
- [CVE-2019-7286](https://insights.sbomify.com/CVE-2019-7286/): Apple Multiple Products Memory Corruption (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-8662 and fix it if it is affected.

What it is: CVE-2019-8662 is a critical use after free vulnerability in Apple Iphone Os, published on 18 Dec 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-8662 exists.

Affected product: Apple Iphone 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-2019-8662/ (Markdown: https://insights.sbomify.com/CVE-2019-8662/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-8662
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-8662
- OSV: https://osv.dev/vulnerability/CVE-2019-8662

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-8662/
Summaries are generated and may contain mistakes; the official description above is the record.