# CVE-2023-43520: Stack-based Buffer Overflow in WLAN HOST

> A stack-based buffer overflow in Qualcomm WLAN HOST allows attackers to execute arbitrary code or escalate privileges via malicious beacon frames.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 6 Feb 2024
- **Updated:** 9 May 2025
- **Also known as:** 3575335, A-309461173, ASB-A-309461173, GHSA-fv23-fj7r-w7w4

## What is CVE-2023-43520?

CVE-2023-43520 is a high-severity memory corruption vulnerability in Qualcomm Ar8035 Firmware, published on 6 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Memory corruption when AP includes TID to link mapping IE in the beacons and STA is parsing the beacon TID to link mapping IE.

Weakness: CWE-787 (Out-of-bounds Write), CWE-121 (Stack-based Buffer Overflow)

## Which versions are affected by CVE-2023-43520?

It affects 70 products.


Products: Qualcomm Ar8035 Firmware, Qualcomm Fastconnect 6900 Firmware, Qualcomm Fastconnect 7800 Firmware, Qualcomm Flight Rb5 5g Platform Firmware, Qualcomm Qam8255p Firmware, Qualcomm Qam8650p Firmware, Qualcomm Qam8775p Firmware, Qualcomm Qamsrv1h Firmware, Qualcomm Qamsrv1m Firmware, Qualcomm Qca6391 Firmware, Qualcomm Qca6554a Firmware, Qualcomm Qca6564au Firmware, Qualcomm Qca6574 Firmware, Qualcomm Qca6574a Firmware, Qualcomm Qca6574au Firmware, Qualcomm Qca6584au Firmware, Qualcomm Qca6595 Firmware, Qualcomm Qca6595au Firmware, Qualcomm Qca6688aq Firmware, Qualcomm Qca6696 Firmware and 50 more.

## How do I fix CVE-2023-43520?

Apply the vendor's patch.

## Is CVE-2023-43520 being exploited?

There is no known exploitation of CVE-2023-43520 in the wild and no public exploit code.

## Other vulnerabilities in Qualcomm Ar8035 Firmware

- [CVE-2023-33106](https://insights.sbomify.com/CVE-2023-33106/): Qualcomm Multiple Chipsets Use of Out-of-Range Pointer Offset (high 8.4, exploited in the wild)
- [CVE-2024-45569](https://insights.sbomify.com/CVE-2024-45569/): Improper Validation of Array Index in WLAN Host Communication (critical 9.8)
- [CVE-2024-21473](https://insights.sbomify.com/CVE-2024-21473/): Improper Input Validation in WIN SON (critical 9.8)
- [CVE-2023-28582](https://insights.sbomify.com/CVE-2023-28582/): Buffer Copy Without Checking Size of Input in Data Modem (critical 9.8)
- [CVE-2023-43552](https://insights.sbomify.com/CVE-2023-43552/): Use After Free in WLAN Host Communication (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-43520 and fix it if it is affected.

What it is: CVE-2023-43520 is a high-severity memory corruption vulnerability in Qualcomm Ar8035 Firmware, published on 6 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-43520 in the wild and no public exploit code.

Affected product: Qualcomm Ar8035 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-2023-43520/ (Markdown: https://insights.sbomify.com/CVE-2023-43520/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-43520
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-43520
- OSV: https://osv.dev/vulnerability/CVE-2023-43520

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-43520/
Summaries are generated and may contain mistakes; the official description above is the record.