What is CVE-2021-1921?

CVE-2021-1921 is a high-severity vulnerability in Qualcomm Aqt1000, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.8/10. Published 2021-11-12.

How severe is CVE-2021-1921?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Qualcomm Aqt1000

CVE-2021-1921

Possible memory corruption due to Improper handling of hypervisor unmap operations for concurrent memory operations in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

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

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (1.1th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 1.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

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

Frequently asked questions

What is CVE-2021-1921?: CVE-2021-1921 is a high-severity vulnerability in Qualcomm Aqt1000, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.8/10. Published 2021-11-12.
How severe is CVE-2021-1921?: High severity. CVSS v3 base score is 7.8 out of 10.