# CVE-2025-21435: Buffer Over-read in WLAN Host Communication

> A buffer over-read in Qualcomm WLAN host communication allows attackers to cause a transient denial of service via crafted beacon frames.

- **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:** Yes
- **Published:** 7 Apr 2025
- **Updated:** 7 Apr 2025
- **Also known as:** 3924648, A-388047607, ASB-A-388047607, GHSA-4q5q-cfpq-3h3j

## What is CVE-2025-21435?

CVE-2025-21435 is a high-severity denial of service vulnerability in Qualcomm Ar8035 Firmware, published on 7 Apr 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Transient DOS may occur while parsing extended IE in beacon.

Weakness: CWE-126 (Buffer Over-read)

## Which versions are affected by CVE-2025-21435?

It affects 149 products.


Products: Qualcomm Ar8035 Firmware, Qualcomm Csr8811 Firmware, Qualcomm Fastconnect 6800 Firmware, Qualcomm Fastconnect 6900 Firmware, Qualcomm Fastconnect 7800 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, Qualcomm Immersive Home 326 Platform Firmware, Qualcomm Ipq5010 Firmware, Qualcomm Ipq5028 Firmware, Qualcomm Ipq5300 Firmware, Qualcomm Ipq5302 Firmware, Qualcomm Ipq5312 Firmware, Qualcomm Ipq5332 Firmware, Qualcomm Ipq6000 Firmware, Qualcomm Ipq6010 Firmware, Qualcomm Ipq6018 Firmware and 129 more.

## How do I fix CVE-2025-21435?

Apply the vendor's patch.

## Is CVE-2025-21435 being exploited?

There is no known exploitation of CVE-2025-21435 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-2025-21435 and fix it if it is affected.

What it is: CVE-2025-21435 is a high-severity denial of service vulnerability in Qualcomm Ar8035 Firmware, published on 7 Apr 2025. 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-2025-21435 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-2025-21435/ (Markdown: https://insights.sbomify.com/CVE-2025-21435/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-21435
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-21435
- OSV: https://osv.dev/vulnerability/CVE-2025-21435

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-21435/
Summaries are generated and may contain mistakes; the official description above is the record.