# CVE-2023-21672: Use After Free in Audio

> A use-after-free vulnerability in Android Audio allows attackers to execute arbitrary code or escalate privileges via concurrent tunnel playback or recording sessions.

- **Severity:** High 8.4 (`CVSS:3.1/AV:L/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 4 Jul 2023
- **Updated:** 2 Aug 2024
- **Also known as:** 3313322, A-276751075, ASB-A-276751075, GHSA-32pq-c6vh-9cq5

## What is CVE-2023-21672?

CVE-2023-21672 is a high-severity use after free vulnerability in Qualcomm Fastconnect 6700 Firmware, published on 4 Jul 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Memory corruption in Audio while running concurrent tunnel playback or during concurrent audio tunnel recording sessions.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2023-21672?

It affects 57 products.


Products: Qualcomm Fastconnect 6700 Firmware, Qualcomm Fastconnect 6900 Firmware, Qualcomm Fastconnect 7800 Firmware, Qualcomm Qam8255p Firmware, Qualcomm Qam8295p Firmware, Qualcomm Qam8650p Firmware, Qualcomm Qam8775p Firmware, Qualcomm Qca6574 Firmware, Qualcomm Qca6574a Firmware, Qualcomm Qca6574au Firmware, Qualcomm Qca6595 Firmware, Qualcomm Qca6595au Firmware, Qualcomm Qca6696 Firmware, Qualcomm Qca6698aq Firmware, Qualcomm Qca6797aq Firmware, Qualcomm Qcm4325 Firmware, Qualcomm Sa4150p Firmware, Qualcomm Sa4155p Firmware, Qualcomm Sa6145p Firmware, Qualcomm Sa6150p Firmware and 37 more.

## How do I fix CVE-2023-21672?

Apply the vendor's patch.

## Is CVE-2023-21672 being exploited?

There is no known exploitation of CVE-2023-21672 in the wild and no public exploit code.

## Other vulnerabilities in Qualcomm Fastconnect 6700 Firmware

- [CVE-2024-43047](https://insights.sbomify.com/CVE-2024-43047/): Qualcomm Multiple Chipsets Use-After-Free (high 7.8, exploited in the wild)
- [CVE-2023-21671](https://insights.sbomify.com/CVE-2023-21671/): Improper Input Validation in Core (critical 9.3)
- [CVE-2024-21464](https://insights.sbomify.com/CVE-2024-21464/): Buffer Copy Without Checking Size of Input in Data Network Stack & Connectivity (high 8.4)
- [CVE-2024-33047](https://insights.sbomify.com/CVE-2024-33047/): Buffer Over-read in Display (high 8.4)
- [CVE-2024-23360](https://insights.sbomify.com/CVE-2024-23360/): Improper Access Control in Graphics Windows (high 8.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-21672 and fix it if it is affected.

What it is: CVE-2023-21672 is a high-severity use after free vulnerability in Qualcomm Fastconnect 6700 Firmware, published on 4 Jul 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-21672 in the wild and no public exploit code.

Affected product: Qualcomm Fastconnect 6700 Firmware. 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-2023-21672/ (Markdown: https://insights.sbomify.com/CVE-2023-21672/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-21672
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-21672
- OSV: https://osv.dev/vulnerability/CVE-2023-21672

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-21672/
Summaries are generated and may contain mistakes; the official description above is the record.