# CVE-2023-21633: Improper Restriction of Operations within the Bounds of a Memory Buffer in Linux

> A memory corruption flaw in Qualcomm Snapdragon firmware allows attackers to execute arbitrary code or escalate privileges via IMS registration messages.

- **Severity:** Medium 6.7 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Jul 2023
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-fg3g-frcw-5756

## What is CVE-2023-21633?

CVE-2023-21633 is a medium-severity memory corruption vulnerability in Qualcomm Apq8064au 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 Linux while processing QcRilRequestImsRegisterMultiIdentityMessage request.

Weakness: CWE-787 (Out-of-bounds Write), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2023-21633?

It affects 97 products.


Products: Qualcomm Apq8064au Firmware, Qualcomm Aqt1000 Firmware, Qualcomm Fastconnect 6200 Firmware, Qualcomm Fastconnect 6800 Firmware, Qualcomm Fastconnect 6900 Firmware, Qualcomm Msm8996au Firmware, Qualcomm Qam8295p Firmware, Qualcomm Qca6391 Firmware, Qualcomm Qca6420 Firmware, Qualcomm Qca6421 Firmware, Qualcomm Qca6426 Firmware, Qualcomm Qca6430 Firmware, Qualcomm Qca6431 Firmware, Qualcomm Qca6436 Firmware, Qualcomm Qca6564 Firmware, Qualcomm Qca6564a Firmware, Qualcomm Qca6564au Firmware, Qualcomm Qca6574 Firmware, Qualcomm Qca6574a Firmware, Qualcomm Qca6574au Firmware and 77 more.

## How do I fix CVE-2023-21633?

No fix has been published for CVE-2023-21633 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-21633 being exploited?

There is no known exploitation of CVE-2023-21633 in the wild and no public exploit code.

## Other vulnerabilities in Qualcomm Apq8064au Firmware

- [CVE-2022-33219](https://insights.sbomify.com/CVE-2022-33219/): Integer Overflow to Buffer Overflow in Automotive (critical 9.3)
- [CVE-2023-21643](https://insights.sbomify.com/CVE-2023-21643/): Untrusted Pointer Dereference in Automotive (critical 9.1)
- [CVE-2025-27074](https://insights.sbomify.com/CVE-2025-27074/): Incorrect Calculation of Buffer Size in SCE-Mink (high 8.8)
- [CVE-2023-33021](https://insights.sbomify.com/CVE-2023-33021/): Use After Free in Graphics (high 8.4)
- [CVE-2023-21632](https://insights.sbomify.com/CVE-2023-21632/): Stack-based Buffer Overflow in Automotive GPU (high 8.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-21633 and fix it if it is affected.

What it is: CVE-2023-21633 is a medium-severity memory corruption vulnerability in Qualcomm Apq8064au 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-2023-21633 in the wild and no public exploit code.

Affected product: Qualcomm Apq8064au 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-2023-21633/ (Markdown: https://insights.sbomify.com/CVE-2023-21633/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-21633
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-21633
- OSV: https://osv.dev/vulnerability/CVE-2023-21633

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-21633/
Summaries are generated and may contain mistakes; the official description above is the record.