# CVE-2021-1974: Memory corruption in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Wearables, Snapdragon Wired Infrastructure and Networking

> A buffer over-read in Qualcomm Snapdragon firmware allows attackers to read sensitive memory or cause denial of service due to SMMU alignment issues.

- **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:** 9 Sep 2021
- **Updated:** 3 Aug 2024
- **Also known as:** 2728644, A-190403734, ASB-A-190403734, GHSA-55x4-8xjx-px24

## What is CVE-2021-1974?

CVE-2021-1974 is a high-severity memory corruption vulnerability in Qualcomm Aqt1000 Firmware, published on 9 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Possible buffer over read due to lack of alignment between map or unmap length of IPA SMMU and WLAN SMMU in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Wearables, Snapdragon Wired Infrastructure and Networking

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2021-1974?

It affects 190 products.


Products: Qualcomm Aqt1000 Firmware, Qualcomm Ar8035 Firmware, Qualcomm Ar9380 Firmware, Qualcomm Csr8811 Firmware, Qualcomm Csrb31024 Firmware, Qualcomm Fsm10055 Firmware, Qualcomm Fsm10056 Firmware, Qualcomm Ipq4018 Firmware, Qualcomm Ipq4019 Firmware, Qualcomm Ipq4028 Firmware, Qualcomm Ipq4029 Firmware, Qualcomm Ipq5010 Firmware, Qualcomm Ipq5018 Firmware, Qualcomm Ipq6000 Firmware, Qualcomm Ipq6010 Firmware, Qualcomm Ipq6018 Firmware, Qualcomm Ipq6028 Firmware, Qualcomm Ipq8064 Firmware, Qualcomm Ipq8065 Firmware, Qualcomm Ipq8068 Firmware and 170 more.

## How do I fix CVE-2021-1974?

Apply the vendor's patch.

## Is CVE-2021-1974 being exploited?

There is no known exploitation of CVE-2021-1974 in the wild and no public exploit code.

## 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-2021-1974 and fix it if it is affected.

What it is: CVE-2021-1974 is a high-severity memory corruption vulnerability in Qualcomm Aqt1000 Firmware, published on 9 Sep 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-2021-1974 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-2021-1974/ (Markdown: https://insights.sbomify.com/CVE-2021-1974/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-1974
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-1974
- OSV: https://osv.dev/vulnerability/CVE-2021-1974

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-1974/
Summaries are generated and may contain mistakes; the official description above is the record.