# CVE-2021-1931: Memory corruption in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Voice & Music

> A buffer overflow in Qualcomm Snapdragon firmware allows attackers to execute arbitrary code or escalate privileges via fast boot commands.

- **Severity:** Medium 6.7 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 13 Jul 2021
- **Updated:** 3 Aug 2024
- **Also known as:** 2820093, A-179057550, ASB-A-179057550, GHSA-76g8-78xr-pq89

## What is CVE-2021-1931?

CVE-2021-1931 is a medium-severity memory corruption vulnerability in Qualcomm Aqt1000 Firmware, published on 13 Jul 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Possible buffer overflow due to improper validation of buffer length while processing fast boot commands in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Voice & Music

Weakness: CWE-120 (Buffer Copy without Checking Size of Input)

## Which versions are affected by CVE-2021-1931?

It affects 121 products.


Products: Qualcomm Aqt1000 Firmware, Qualcomm Ar8031 Firmware, Qualcomm Ar8035 Firmware, Qualcomm Csra6620 Firmware, Qualcomm Csra6640 Firmware, Qualcomm Csrb31024 Firmware, Qualcomm Fsm10055 Firmware, Qualcomm Fsm10056 Firmware, Qualcomm Qca6174a Firmware, Qualcomm Qca6310 Firmware, Qualcomm Qca6320 Firmware, Qualcomm Qca6335 Firmware, Qualcomm Qca6390 Firmware, Qualcomm Qca6391 Firmware, Qualcomm Qca6420 Firmware, Qualcomm Qca6421 Firmware, Qualcomm Qca6426 Firmware, Qualcomm Qca6430 Firmware, Qualcomm Qca6431 Firmware, Qualcomm Qca6436 Firmware and 101 more.

## How do I fix CVE-2021-1931?

Apply the vendor's patch.

## Is CVE-2021-1931 being exploited?

There is no known exploitation of CVE-2021-1931 in the wild and no public exploit code.

Public exploit code:

- Unlock the Meta Quest 1 bootloader and gain root access using GhostLock + CVE-2021-1931. (github_poc): https://github.com/starseed12345/QuestStack
- proof of concept CVE-2021-1931 exploit for the blackberry key2 (le) that allows to flash unsigned images temporarily (github_poc): https://github.com/FakeShell/CVE-2021-1931-BBRY-KEY2
- My take on unlocking Xperia 5 SO-01M for p42 bootloader using CVE-2021-1931 (github_poc): https://github.com/aomsin2526/xperia_5_bl_unlocker_poc
- BlackBerry KEY2 (BBF100-6) bootloader unlock (CVE-2021-1931), unlock-tool RE, recon, and LineageOS research (github_poc): https://github.com/stanw47/Blackberry-Key2-Research

## Other vulnerabilities in Qualcomm Aqt1000 Firmware

- [CVE-2025-21479](https://insights.sbomify.com/CVE-2025-21479/): Qualcomm Multiple Chipsets Incorrect Authorization (high 8.6, exploited in the wild)
- [CVE-2025-21480](https://insights.sbomify.com/CVE-2025-21480/): Qualcomm Multiple Chipsets Incorrect Authorization (high 8.6, exploited in the wild)
- [CVE-2023-28562](https://insights.sbomify.com/CVE-2023-28562/): Buffer Copy Without Checking Size of Input in QESL (critical 9.8)
- [CVE-2022-40514](https://insights.sbomify.com/CVE-2022-40514/): Buffer copy without checking size of input in WLAN Firmware (critical 9.8)
- [CVE-2022-22096](https://insights.sbomify.com/CVE-2022-22096/): Memory corruption in Snapdragon Connectivity, Snapdragon Mobile (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-1931 and fix it if it is affected.

What it is: CVE-2021-1931 is a medium-severity memory corruption vulnerability in Qualcomm Aqt1000 Firmware, published on 13 Jul 2021. 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-2021-1931 in the wild and no public exploit code.

Affected product: Qualcomm Aqt1000 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-2021-1931/ (Markdown: https://insights.sbomify.com/CVE-2021-1931/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-1931
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-1931
- OSV: https://osv.dev/vulnerability/CVE-2021-1931

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-1931/
Summaries are generated and may contain mistakes; the official description above is the record.