# CVE-2023-43536: Buffer Over-read in WLAN Firmware

> A buffer over-read in Qualcomm Snapdragon WLAN firmware allows attackers to cause a transient denial of service by sending malformed FILS information elements.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:** 6 Feb 2024
- **Updated:** 2 Aug 2024
- **Also known as:** GHSA-cffx-cf3x-mr9h

## What is CVE-2023-43536?

CVE-2023-43536 is a high-severity denial of service vulnerability in Qualcomm 315 5g Iot Modem 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

Transient DOS while parse fils IE with length equal to 1.

Weakness: CWE-126 (Buffer Over-read)

## Which versions are affected by CVE-2023-43536?

It affects 309 products.


Products: Qualcomm 315 5g Iot Modem Firmware, Qualcomm Aqt1000 Firmware, Qualcomm Ar8031 Firmware, Qualcomm Ar8035 Firmware, Qualcomm Ar9380 Firmware, Qualcomm Csr8811 Firmware, Qualcomm Csra6620 Firmware, Qualcomm Csra6640 Firmware, Qualcomm Csrb31024 Firmware, Qualcomm Fastconnect 6200 Firmware, Qualcomm Fastconnect 6700 Firmware, Qualcomm Fastconnect 6800 Firmware, Qualcomm Fastconnect 6900 Firmware, Qualcomm Fastconnect 7800 Firmware, Qualcomm Flight Rb5 5g Platform Firmware, Qualcomm Immersive Home 214 Platform Firmware, Qualcomm Immersive Home 216 Platform Firmware, Qualcomm Immersive Home 316 Platform Firmware, Qualcomm Immersive Home 318 Platform Firmware, Qualcomm Immersive Home 3210 Platform Firmware and 289 more.

## How do I fix CVE-2023-43536?

No fix has been published for CVE-2023-43536 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-43536 being exploited?

There is no known exploitation of CVE-2023-43536 in the wild and no public exploit code.

## Other vulnerabilities in Qualcomm 315 5g Iot Modem Firmware

- [CVE-2023-33107](https://insights.sbomify.com/CVE-2023-33107/): Qualcomm Multiple Chipsets Integer Overflow (high 8.4, exploited in the wild)
- [CVE-2023-33063](https://insights.sbomify.com/CVE-2023-33063/): Qualcomm Multiple Chipsets Use-After-Free (high 7.8, exploited in the wild)
- [CVE-2025-27034](https://insights.sbomify.com/CVE-2025-27034/): Improper Validation of Array Index in Multi-Mode Call Processor (critical 9.8)
- [CVE-2023-22388](https://insights.sbomify.com/CVE-2023-22388/): Use of Out-of-range Pointer Offset in Multi-mode Call Processor (critical 9.8)
- [CVE-2023-28578](https://insights.sbomify.com/CVE-2023-28578/): Improper Input Validation in Services (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-43536 and fix it if it is affected.

What it is: CVE-2023-43536 is a high-severity denial of service vulnerability in Qualcomm 315 5g Iot Modem 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-2023-43536 in the wild and no public exploit code.

Affected product: Qualcomm 315 5g Iot Modem 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-2023-43536/ (Markdown: https://insights.sbomify.com/CVE-2023-43536/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-43536
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-43536
- OSV: https://osv.dev/vulnerability/CVE-2023-43536

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-43536/
Summaries are generated and may contain mistakes; the official description above is the record.