What is CVE-2021-1924?

CVE-2021-1924 is a critical-severity vulnerability in Qualcomm Apq8009, classified under Observable Discrepancy. CVSS score: 9.0/10. Published 2021-11-12.

How severe is CVE-2021-1924?

Critical severity. CVSS v3 base score is 9.0 out of 10.

Vulnerability in Qualcomm Apq8009

CVE-2021-1924

Information disclosure through timing and power side-channels during mod exponentiation for RSA-CRT in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon IoT, Snapdragon Voice & Music, Snapdragon Wearables, Snapdragon Wired Infrastructure and Networking

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

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.002 (5.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 5.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

References

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

Frequently asked questions

What is CVE-2021-1924?: CVE-2021-1924 is a critical-severity vulnerability in Qualcomm Apq8009, classified under Observable Discrepancy. CVSS score: 9.0/10. Published 2021-11-12.
How severe is CVE-2021-1924?: Critical severity. CVSS v3 base score is 9.0 out of 10.