What is CVE-2021-30321?

CVE-2021-30321 is a critical-severity vulnerability in Qualcomm Aqt1000, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-11-12.

How severe is CVE-2021-30321?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Qualcomm Aqt1000

CVE-2021-30321

Possible buffer overflow due to lack of parameter length check during MBSSID scan IE parse in Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity

Vulnerability class: Buffer Overflow

Published 2021-11-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (54.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

www.qualcomm.com/company/product-security/bulletins/november-2021-bulletin (Vendor Advisory)

Frequently asked questions

What is CVE-2021-30321?: CVE-2021-30321 is a critical-severity vulnerability in Qualcomm Aqt1000, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-11-12.
How severe is CVE-2021-30321?: Critical severity. CVSS v3 base score is 9.8 out of 10.