CVE-2021-1956

What it is

Improper handling of ASB-U packet with L2CAP channel ID by slave host can lead to interference with piconet in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Voice & Music

At a glance

Exploitability

Can be exploited from the same network segment without logging in. High risk of service disruption.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-09-09 08:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:33 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.2% in the next 30 days (EPSS).
• Severity: 6.5 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2021-09-09 08:15 UTC

Last modified

2026-06-17 03:33 UTC

Exploit probability

0.2% · EPSS, next 30 days

Record status

Modified

Affected

• Qualcomm aqt1000 Firmware
• Qualcomm ar8035 Firmware
• Qualcomm csrb31024 Firmware
• Qualcomm qca6175a Firmware
• Qualcomm qca6390 Firmware
• Qualcomm qca6391 Firmware
• Qualcomm qca6420 Firmware
• Qualcomm qca6430 Firmware

Attack profile CVSS 3.1 · 6.5

Attack vector

Adjacent network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-1956.md and follow it. Check whether this project is affected by CVE-2021-1956. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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