CVE-2021-1956

CVE-2021-1956 is a medium-severity vulnerability in Qualcomm Aqt1000 Firmware with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

• Severity: Medium (CVSS 3.x base score 6.5)
• CVSS v2: 3.3
• EPSS exploit prediction: 0% (14th percentile)
• Actively exploited: Not listed in CISA KEV
• Affected product: Qualcomm Aqt1000 Firmware
• Published: 2021-09-09
• Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2021-1956?

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

How severe is CVE-2021-1956?

CVE-2021-1956 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-1956 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-1956?

CVE-2021-1956 primarily affects Qualcomm Aqt1000 Firmware. In total, 42 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-1956?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-1956 published?

CVE-2021-1956 was published on 2021-09-09 and last updated on 2026-06-17.

References

• https://www.qualcomm.com/company/product-security/bulletins/september-2021-bulletin

Affected products (42)

• cpe:2.3:o:qualcomm:aqt1000_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:ar8035_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:csrb31024_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6175a_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6390_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6391_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6420_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6430_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6564a_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6564au_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6574_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6574a_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6574au_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6584au_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6595_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6595au_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca6696_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qca8337_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qcn7605_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qcn7606_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:qcx315_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa415m_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa515m_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa6145p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa6150p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa6155_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa6155p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa8145p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa8150p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa8155_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa8155p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sa8195p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sc8180x\+sdx55_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sd_8c_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sd_8cx_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:sdx55_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:wcd9340_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:wcd9341_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:wcd9360_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:qualcomm:wcn3998_firmware:-:*:*:*:*:*:*:*

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