What is CVE-2020-3691?

CVE-2020-3691 is a critical-severity vulnerability in Qualcomm Apq8009, classified under Integer Underflow. CVSS score: 9.8/10. Published 2021-01-21.

How severe is CVE-2020-3691?

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

Is CVE-2020-3691 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Integer overflow in Qualcomm Apq8009

CVE-2020-3691

Possible out of bound memory access in audio due to integer underflow while processing modified contents in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon IoT, Snapdragon Mobile, Snapdragon Voice & Music, Snapdragon Wearables, Snapdragon Wired Infrastructure and Networking

Published 2021-01-21 · 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: 0.011 (63.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-191 — Integer Underflow

Public proof-of-concept exploits

TinyNiko/android_

References

www.qualcomm.com/company/product-security/bulletins/december-2020-bulletin (Broken Link)
www.qualcomm.com/company/product-security/bulletins/december-2020-security-bull… (Vendor Advisory)

Frequently asked questions

What is CVE-2020-3691?: CVE-2020-3691 is a critical-severity vulnerability in Qualcomm Apq8009, classified under Integer Underflow. CVSS score: 9.8/10. Published 2021-01-21.
How severe is CVE-2020-3691?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-3691 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.