# CVE-2021-1955: Denial of service in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon IoT, Snapdragon Mobile, Snapdragon Voice & Music, Snapdragon Wearables

> Attackers can cause a denial of service in Qualcomm Snapdragon devices by exploiting improper connection handling when an association is rejected.

- **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:** 13 Jul 2021
- **Updated:** 3 Aug 2024
- **Also known as:** 2810235, 2857049, 2857052, A-184561582, ASB-A-184561582, GHSA-2726-mprm-wgq9

## What is CVE-2021-1955?

CVE-2021-1955 is a high-severity denial of service vulnerability in Qualcomm Apq8009 Firmware, published on 13 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Denial of service in SAP case due to improper handling of connections when association is rejected in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon IoT, Snapdragon Mobile, Snapdragon Voice & Music, Snapdragon Wearables

Weakness: CWE-617 (Reachable Assertion)

## Which versions are affected by CVE-2021-1955?

It affects 178 products.


Products: Qualcomm Apq8009 Firmware, Qualcomm Apq8009w Firmware, Qualcomm Apq8017 Firmware, Qualcomm Apq8053 Firmware, Qualcomm Apq8064au Firmware, Qualcomm Apq8096au Firmware, Qualcomm Aqt1000 Firmware, Qualcomm Ar6003 Firmware, Qualcomm Ar8031 Firmware, Qualcomm Ar8035 Firmware, Qualcomm Csr6030 Firmware, Qualcomm Csra6620 Firmware, Qualcomm Csra6640 Firmware, Qualcomm Csrb31024 Firmware, Qualcomm Mdm8215 Firmware, Qualcomm Mdm8215m Firmware, Qualcomm Mdm8615m Firmware, Qualcomm Mdm9150 Firmware, Qualcomm Mdm9206 Firmware, Qualcomm Mdm9215 Firmware and 158 more.

## How do I fix CVE-2021-1955?

Apply the vendor's patch.

## Is CVE-2021-1955 being exploited?

There is no known exploitation of CVE-2021-1955 in the wild and no public exploit code.

## Other vulnerabilities in Qualcomm Apq8009 Firmware

- [CVE-2021-1905](https://insights.sbomify.com/CVE-2021-1905/): Qualcomm Multiple Chipsets Use-After-Free (high 8.4, exploited in the wild)
- [CVE-2020-11261](https://insights.sbomify.com/CVE-2020-11261/): Qualcomm Multiple Chipsets Improper Input Validation (high 7.8, exploited in the wild)
- [CVE-2021-1906](https://insights.sbomify.com/CVE-2021-1906/): Qualcomm Multiple Chipsets Detection of Error Condition Without Action (medium 6.2, exploited in the wild)
- [CVE-2022-40510](https://insights.sbomify.com/CVE-2022-40510/): Buffer copy without checking size of input in Audio. (critical 9.8)
- [CVE-2022-22088](https://insights.sbomify.com/CVE-2022-22088/): Integer Overflow to Buffer Overflow in Bluetooth HOST (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-1955 and fix it if it is affected.

What it is: CVE-2021-1955 is a high-severity denial of service vulnerability in Qualcomm Apq8009 Firmware, published on 13 Jul 2021. 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-2021-1955 in the wild and no public exploit code.

Affected product: Qualcomm Apq8009 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-2021-1955/ (Markdown: https://insights.sbomify.com/CVE-2021-1955/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-1955
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-1955
- OSV: https://osv.dev/vulnerability/CVE-2021-1955

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-1955/
Summaries are generated and may contain mistakes; the official description above is the record.