# CVE-2021-35077: Use after free in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Industrial IOT, Snapdragon Mobile

> A use-after-free vulnerability in Qualcomm Snapdragon DSP offloads allows attackers to execute arbitrary code or escalate privileges via dynamic process spawning.

- **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:** 11 Feb 2022
- **Updated:** 4 Aug 2024
- **Also known as:** 3007135, A-204904989, ASB-A-204904989, GHSA-q4j4-5q6v-59p6

## What is CVE-2021-35077?

CVE-2021-35077 is a high-severity use after free vulnerability in Qualcomm Ar8035 Firmware, published on 11 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Possible use after free scenario in compute offloads to DSP while multiple calls spawn a dynamic process in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Industrial IOT, Snapdragon Mobile

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2021-35077?

It affects 71 products.


Products: Qualcomm Ar8035 Firmware, Qualcomm Qca6174a Firmware, Qualcomm Qca6390 Firmware, Qualcomm Qca6391 Firmware, Qualcomm Qca6574 Firmware, Qualcomm Qca6574a Firmware, Qualcomm Qca6574au Firmware, Qualcomm Qca6595au Firmware, Qualcomm Qca6696 Firmware, Qualcomm Qca8081 Firmware, Qualcomm Qca8337 Firmware, Qualcomm Qca9377 Firmware, Qualcomm Qcm2290 Firmware, Qualcomm Qcm4290 Firmware, Qualcomm Qcm6490 Firmware, Qualcomm Qcs2290 Firmware, Qualcomm Qcs4290 Firmware, Qualcomm Qcs6490 Firmware, Qualcomm Qrb5165 Firmware, Qualcomm Qrb5165m Firmware and 51 more.

## How do I fix CVE-2021-35077?

Apply the vendor's patch.

## Is CVE-2021-35077 being exploited?

There is no known exploitation of CVE-2021-35077 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-2021-35077 and fix it if it is affected.

What it is: CVE-2021-35077 is a high-severity use after free vulnerability in Qualcomm Ar8035 Firmware, published on 11 Feb 2022. 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-2021-35077 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-2021-35077/ (Markdown: https://insights.sbomify.com/CVE-2021-35077/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-35077
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-35077
- OSV: https://osv.dev/vulnerability/CVE-2021-35077

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-35077/
Summaries are generated and may contain mistakes; the official description above is the record.