# CVE-2021-35111: Race condition in Snapdragon Connectivity, Snapdragon Mobile

> A race condition in Qualcomm Snapdragon firmware allows attackers to potentially execute code or escalate privileges via improper tag ID validation.

- **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:** 14 Jun 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-f8p5-mp9v-v67f

## What is CVE-2021-35111?

CVE-2021-35111 is a high-severity vulnerability in Qualcomm Ar8035 Firmware, published on 14 Jun 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper validation of tag id while RRC sending tag id to MAC can lead to TOCTOU race condition in Snapdragon Connectivity, Snapdragon Mobile

Weakness: CWE-367 (Time-of-check Time-of-use (TOCTOU) Race Condition), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2021-35111?

It affects 38 products.


Products: Qualcomm Ar8035 Firmware, Qualcomm Qca6390 Firmware, Qualcomm Qca6391 Firmware, Qualcomm Qca8081 Firmware, Qualcomm Qca8337 Firmware, Qualcomm Sd765 Firmware, Qualcomm Sd765g Firmware, Qualcomm Sd768g Firmware, Qualcomm Sd778g Firmware, Qualcomm Sd865 5g Firmware, Qualcomm Sd870 Firmware, Qualcomm Sd888 5g Firmware, Qualcomm Sd 8 Gen1 5g Firmware, Qualcomm Sdx55 Firmware, Qualcomm Sdx55m Firmware, Qualcomm Sdx65 Firmware, Qualcomm Sm7250p Firmware, Qualcomm Sm7450 Firmware, Qualcomm Sm8475 Firmware, Qualcomm Sm8475p Firmware and 18 more.

## How do I fix CVE-2021-35111?

No fix has been published for CVE-2021-35111 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-35111 being exploited?

There is no known exploitation of CVE-2021-35111 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-2021-35111 and fix it if it is affected.

What it is: CVE-2021-35111 is a high-severity vulnerability in Qualcomm Ar8035 Firmware, published on 14 Jun 2022. 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-2021-35111 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-2021-35111/ (Markdown: https://insights.sbomify.com/CVE-2021-35111/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-35111
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-35111
- OSV: https://osv.dev/vulnerability/CVE-2021-35111

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-35111/
Summaries are generated and may contain mistakes; the official description above is the record.